Well, that's really a bummer. There is no really good easy fix. A proper fix will involve repainting, and of course you don't want to do that.

So, treat the brazing and repainting option as the most extreme option, one that remains an option no matter what you do.

Before you go that route, you can carefully file of the damaged guide and replace it with a clamp or a glued-on guide.

Before you do that, try to fix them as well as possible. For the smashed one, I'd insert a gently tapered steel tool, like an awl maybe; tap it in until the hole is round, then tap it back out again.
The broken one, insert the same tool and tap the bent metal down until the crack closes up. I don't think any glue, epoxy, JBWeld or anything is going to do any good, likely just make a mess that's hard to clean up.