Why Zilean's W Should be a Passive Ability/Changed

There's no decision-making to using W and everything it does could be automated without any gameplay loss. This is a sign of a design in need of some love and it's a stark contrast to champions like Karma. In Karma's case, the modifier key is R and you can change your abilities significantly when using it in the right context. Jayce is another example of this. For Zilean, it's a tedious and pointless ability which seems to exist only because there's a W key. It might seem odd to say this since you press W to use an ability twice and you need to make the right choice. However, upon closer inspection, this is a false sense of agency and doesn't enrich gameplay. The real choice is whether you want to use E or Q twice, not whether to press W.

Here is W's description from the Wiki:

Rewind COST: 35 MANA COOLDOWN: 14 / 12 / 10 / 8 / 6 ACTIVE: Zilean reduces Time Bomb and Time Warp's cooldowns by 10 seconds.

W works only on Q and E so you could have the same effect by integrating W into each of these abilities or having W's effects be part of Zilean's passive. This is the conceptual strange and the _numbers would of course need tweaking _ but an idea for Zilean's passive to maintain his exact gameplay while opening new avenues for W could be:

When Q or E are reactivated, their cooldowns are reduced by 10 seconds but there is an additional 35 mana cost for the first ability cast. This has an internal cooldown of 14 / 12 / 10 / 8 / 6 at levels a, b, c, d, e.

That's all! You now have everything that W does without needing to waste an ability on a non-interactive feature. All you have to do is figure out a more interesting W and balance the new passive around it. This is the crux of the design and everything flows smoothly and naturally from it.

However, this would make Zilean a strategically more complex champion and perhaps Riot doesn't want that. I have an alternative that also reduces finger strain but is less ambitious and requires no extra effort on the part of current Zilean players. W can become a passive ability which is leveled up just as it is right now. Instead of the description above applying to Zilean's passive, it is simply moved to W. This is similar to how Vayne's W is designed and actually doesn't change any of Zilean's gameplay or tuning. It would merely be a QoL change.

What do you think a new Zilean W could be and which design would you prefer?