I really love all the different versions of characters you have! Mostly because I do love mishmashing everyone together just to see all the chaos that ensues!
At least Steve is a little more familiar with different dimensions and timelines and what not at this point. I'm sure bb!Steve (aka First Avenger) would be completely out of his league and just slightly overwhelmed.
Kate will be happy to gossip all over the place about Thor and Loki with Angela amongst other things. The rest of your gang sounds amazing so I will definitely be looking forward to all the writing and plotting!