Input buffering when stunned?

Hi! I'm only a silver player but using input buffering for combos increased my league performance by a huge amount. My Question is now if I can use input buffering defensively: When I am getting stunned, can I input buffer my next ability? For example Renekton E or Fizz E, so when I get out of a stun (for example Veigar W) I instantly dash away. I think it works when coming out of Zhonyas, but not when stunned by an enemy (I know, Zhonyas is stasis, not stun).

I am asking because I think there must be a better way than mashing your button furiosly until something happens lol