There isn't a way to remap keys, sorry. It's been considered before, but we don't prioritize it and there's other things we'd rather work on first.

Not sure what else to suggest ... a Lua script to replicate zoom on another key is possible in theory but would be complex. Maybe something at the OS-level can remap it?

I had a broken 'p' key for many months, but thankfully p isn't important in tpt. I just ignored it, if I mashed p really hard it would type it, otherwise I would copy paste the letter from somewhere else.