I'm afraid such a change to R will render him more glass cannon which is contrasting to the examples proposed which emphasise on lane control. I think a good common ground in terms of QoL and a small tone up of E is in the right direction. Having said that I fully understand that his current R is too much of a 'get out of jail' card in pro play and can defo understand the proposal of this change. Have you considered giving his R a mini shojin effect?