Runes are too restricting, What about choosing a 7th "Wildcard" Rune

After playing with Runes Reforged for a year and trying to theorycraft/playtest new Rune setups and item builds, I can say that the new system feels far too restricting for the amount and diversity of choices given. The old Runes & Masteries had to issue of there almost always being the "optimal setup". Since there were only 3 Mastery Trees, you didn't have a lot of choices, and Runes for mostly catered for the early game. This problem plagued almost every champion and was supposed to be mostly corrected in Runes Reforged. Even now, there are still "optimal builds" that change when one rune gets nerfed. They gave us 5 Paths and way more options than before, but only allow us to pick between 2 of them. While there have been more unique builds that weren't possible in the old system, even those builds seem to follow the exact same setup and only change when something in nerfed.

Riot made Runes Reforged to make us really think about the choices we made with runes and how they catered to out playstyle. However, with how unbalanced the Runes still are, players are forced to choose between what they WANT and what they NEED, and they don't always overlap. Despite the cool things you can do now, players still end up picking the most optimal build instead of what they want because they Runes themselves are so much stronger than the old system. They almost always go for what it strongest, regardless if that is what they want to build. An example as of patch 8.23 is Dark Harvest. Everyone and their mother is taking this Keystone if possible because it is so GENERICALLY powerful. This makes Rune setups feel very restricted because what you want is often in a different Path than what is the "best" and you lose too much by not picking the "best" runes.

The other issue, which is been somewhat solved, was base stat choices. Having stats tied to Paths hindered a LOT of creative freedom because your early game was decided by what runes you wanted. Even if you wanted to say go Domination/Resolve for some extra late game tankiness, your early game was hindered because you had health instead of the extra AD you would normally get from going Sorcery secondary. Stat shards alleviated this issue a lot, but still needs some tuning and maybe some extra stat choices in each row.

These problems, specifically only getting to pick from 2 of 5 paths in a heavily unbalanced system does NOT promote creativity in a healthy way. This current system "promotes" creativity by forcing you to pick what is the best with what little choice you are given. You made do with what you get. As you read in the title, I had the idea of adding a 7th "Wildcard" or Bonus Rune. I, and I'm sure others too, find myself stuck without the runes I actually want because they are in a disadvantageous Path for the build I want to do. This usually occurs with you only wanting one specific runes and no others in a path, but don't want to go into that path for only one rune.

Allowing the choice of one Bonus Rune from any of the 3 remaining Paths could allow for far more creativity in Rune setups and allow real creative freedom in your choices. However, other people I've talked to have said that this may make the game too complicated because you have too much to keep track of. I disagree because the old system had to keep track of. While the old system was weaker, it more choices and more complexity to keep track of, from a larger number of masteries to pick compared to current Runes, and wildly specialized old rune pages. The Bonus Runes would mean the UI would have to be changed again to accommodate another Rune, but, while also now having to keep track of Stat Shards, the extra Rune shouldn't make the System more complex and difficult to keep track of.

These are some examples of new builds I would do to fix problems I constantly have with Rune choices:

Jax:

• Jax in toplane typically goes Precision primary and either Resolve or Inspiration secondary, however I also go Domination, and famous streamers like TF Blade goes Sorcery. While having all of these options is great, only choosing one of them isn't. The example is that I WANT to take Transcendence from Sorcery but not take anything else in that Path, while going instead for Resolve or Domination. Right now, unless I go into Sorcery, there is no meaningful way to hit max CDR with current standard Jax builds without building Essence Reaver (which I hate building because it is blatantly broken). Allowing a 7th Rune would allow me to still go Resolve or Domination, or even Inspiration secondary, and get Transcendence as my single tertiary Rune. This one change could allow me to alter all of my builds to NOT have to build Essence Reaver.
• In really hard matchups, I could also go Resolve secondary and take things like Nullifying Orb, Ravenous Hunter, or Time-Warp Tonic in really miserable poke lanes. This in tandem with the new defense Stat Shards could allow you to better survive the longer laning phase.

Orianna:

• On champs like Orianna, you typically go Sorcery/Inspiration or sometimes Sorcery/Domination. This new rune would allow you go, say, Resolve secondary and still get that one important Rune from Inspiration or Domination and then build more defensive.

This could allow Supports to go into any 2 Paths besides Domination, but still get one of the vision Runes, which would better cater to their play style. Assassins could go Domination/Resolve against bully mages and still get something Triumph from Precision, or get Coup de Grace. Spell-slinging ADC's could still go Precision/Sorcery and also get Ravenous Hunter, or go Precision/Sorcery and still get Manaflow Band to help with sustain. This in particular could help ADC's who no longer have meaningful Mana sustain after the Essence Reaver Rework, while still allowing them to pick a secondary Path that actually caters to their play style.

This change could open up a lot more creative and interesting builds, while allowing meaningful choice in the play style you are looking for how to accent it. This may also introduce more abuse cases, but also introduce more ways to counteract those abuse cases.

Let me know what you think, whether it would be beneficial or overall unhealthy, and what kind of new setups you would do if you had that one extra rune. Thanks!