Been there, done that, ouch! I once had a 35mm f/2 Nikkor that was "modified" by a fire engine one night. I ended up making it a push-pull focus (with vice and hack saw) and used it for a couple of years before I could afford to get it replaced.
Can you put it in a vice and perhaps carefully crush the lens barrel bulging back just a little, especially if it isn't covered by insurance and Zeiss can't fix it? But if it's just a paper weight or close to it, it may be worth considering. Of course, if you don't do it right, the lens may totally lock up and the elements may turn to sand...You are on your own if that's the case!
What about taking it to an independent repair person to perhaps "unbend" it?
I'd be reluctant of using any lube since you can't control where it may migrate within the lens.