Darius Heal Change Up

Hello,

Was just wondering: What if Darius' Q healed him for a % of the health he lost within the past 5 seconds or so? I feel like that would give him that same durability vs assassins, but maybe tone down how hard it is to kill him even when everyone is focusing him and could help in making people feel less punished for getting him low just to watch his hp shoot back up. I don't see him a lot outside of ARAM (I play too much...) but I know it is frustrating in that game mode because he can become far too durable at times.

Not a QQ, just wondering how people think this could affect him.