Irelia Q (bladesurge) passive, charge up idea

A frustrating thing about Irelia is Q'ing onto a low health minion and missing the execute by a few HP, which means the Q doesn't reset. The worst time in during the start of an engage onto an opponent. The buffs prior to 9.2 were helpful and made Q cooldown resets a little easier but her waveclear was overpowered. The recent changes nerfed her Q TOO MUCh, then they buffed it again.

So here is an idea for her Q mechanics that might help balance her Q

What if her Q passive also had a mechanic similar to Statik Shiv? Maybe her Q could build up stacks that discharge on the first minion hit? This would make her engages more consistent and reliable, but would prevent her Q from having too much waveclear. After an engage the initial passive stacks are gone and they would NOT build up again until the next team fight or next minion wave.