Riot do you actually want this?

https://www.youtube.com/watch?v=q2iB5YEGwec

Then there's a couple of things that you'll need to do to make it even remotely possible.

1. Nerf EVERY primary build through champion nerfs.
2. Remove the conditions on all of the unique passives.
3. Move champion scaling away from secondary stats like crit and atk spd, and towards primary stats
4. Slow down the mid game
5. Probably revert the keystones, to remove more conditional benefits

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The relative power gap between champions that you've designed over the past, hell probably 5 years at this point, and unintended builds is too large for "off-meta" builds to have any reasonable chance of success.