I worked at a bike shop where we mainly worked with vintage bikes. I've seen bent frames and forks almost every day. Even if a frame and fork is good quality, we are talking about 20-30 year old stuff here that has been through a lot. (I assume yours is not a newer Tourer?)

A frame builder or a bike shop that has dealt with similar things before could bend the fork back most likely by eyeballing it. If you feel confident you can have a crack at it too. Grinding the dropout is not really the fix. We bent back some lower end steel forks just by eyeballing it where the bike would pull to one side really really hard but tracked perfectly straight afterwards.

Yes, you can still find 22.2 forks, even new ones, and Columbus even makes a carbon threadless one, so there are definitely options.

If you don't have a tool to check the wheel dish rotate the same wheel in the fork and check the unevenness just to be sure. If it's really bad you should feel the bike pulling to one side without your hands on the handlebars.