An idea to rein in Vaynes early game potential

What if the CD on Vaynes Tumble (Q) was fairly long baseline, but had an interaction with her Silverbolts that dramatically reduced its cooldown when you land the third hit and proc it?

This would decrease her early game damage potential fairly well I think (as well as her mobility), but could be tuned to allow her to have the same late game potential as she has currently. A Vayne would be forced to choose whether they want to use their Q to last hit/trade with their lane opponent, or save it for dodging skillshots.

Im not sure if this is just too similar to the way Lucian works with his passive/E though, but I figured it would be a way to get Vaynes early game under control without affecting her late game, and wouldn't require damage tweaks or anything.

Just an idea that popped into my head the other day, nothing special or anything and its probably already been tossed around here before.

Thanks for reading!