Idea to makes Rengars ult fair/ rework stealth

So after watching Jereamys video about Rengar and stealth it got me thinking about how to balance stealth as a mechanic.

So for Rengar I was thinking that when you activate his ult as the screen goes grey you and any enemy's or allies in the area ( think localized Nocturne ult but without the visual effect ) start to hear his heartbeating slowly. During this time his furiosity would be at zero and over 10 seconds it would increase by 1 every 2 seconds* in correlation with his heartbeat. During this time he is stealthed, but as you hear his heartbeat for the duration of the noise he is unstealthed. As the duration drags on his heart beats faster as his ult either times out or he kills an enemy. Then on killing an enemy the duration of his stealth is refreshed **( Kha 'Xix jump reset/ Tristanas jump reset) .

I think a change like this would add a lot more fairness to his opponents while also really sticking with his characters theme of being this amazing hunter.

This might be a good thing to keep in mind when looking at stealth as a whole so maybe they can rework stealth all together someday.

Lemme know what you think

P.s. I don't play regnar at all these are just thoughts sorry *the values are very changeable , leaving room for future tweeking ** I originally thought that stacking would be better ( think Diane is W shield stacking ) but I think It would just be extremely unhealthy so I think just refreshing the duration would be the best way to go.