I wish I worked in Hollywood... Consulting for Kevin Feige or Zack Snyder would've been pretty cool...
Having a bunch of Ant-Men going after a humanoid Galactus would be pretty weird, though. Tough to imagine being able to choreograph anything that doesn't look silly in the final product. And, yeah, of course the prototypical MCU humor would make its way...
They didn't do that for Thanos, though. Part of what made him such a menacing and, IMO, perfect villain. Part of what made Black Panther great, again IMO (and mentioned in Honest Trailers), was his lack of quipping.
I guess time will tell if Jackie Chan makes for a good MCU film. If done well, I suspect that comic fans may enjoy it. I also suspect that the casual fan will not care for it regardless of whether or not we like it.