Does polio Bruce become Batman
Oh wow I didn't expect people to actually like Polio Bruce- the idea had been rotting in my Drafts for so long haha-
Yes! With the help of modern medicine, braces and aids built into the costume, and his normal training, I fully believe Polio Bruce could and would become Batman still. Of course it would be way more difficult now with a life altering chronic illness, but Bruce's guilt and desperation to 'fix his mistakes' would, no matter what, lead him to pursuing crime fighting.
Tho, on the flip side, Polio Bruce would probably never be considered as Batman. His childhood Polio, the death of his parents, and his reclusiveness for a few years means literally no one suspects him of being a crime fighter. When he finally starts playing into the Tragic Rich Boy in public, the "Batman can't be Bruce Wayne!" doubles in popularity cuz poor Bruce tears up every time his parents are mentioned and his Butler is still his main caregiver.
Bruce would be an ambulatory wheelchair user, I think. He can stand and fight and live life walking, but particular after a rough patrol and horrible aches, he has a very nice custom chair. He partially makes a show of it at parties, milling about for just long enough before requesting his wheelchair. It works to garner sympathy... which kinda sucks that able bodied rich people dont respect him as a functional adult but at least they donate a lot of money to research and eradication of polio.