Idea for Galio ult

So I noticed that Malzahar was changed so that his ult was more difficult to interrupt due to CC (no cast time, void shift). I was thinking about other champions that have easy-to-interrupt channels and my mind immediately turned to Galio. Now, while I understand that cancelling someone's channel is a core mechanic in league and you shouldn't just stop everyone with channels from being CC'd, I think that there's a case where Galio would benefit from some CC reduction while ulting.

In particular, my suggestion is that Galio's ult should not be interrupted by hard CC from auto attack modifiers. What this means is that champions not caught in Galio's ult will still be able to interrupt him like normal, but he should feel better about ulting the enemy Leona or Blitzcrank to keep his carries safe. I'm sick of ulting to protect everyone only to have it immediately cancelled by a Blitz knockup or Xin Zhao's three talon strike.

Thoughts? I'm wondering if other auto attack modifiers should be considered for an adjustment during Galio's ult, but I think they're in a pretty healthy place. I just don't want my ult to work against me when it's the situationally appropriate choice.