The front subframe and all the stuff attached to it should actually come off quite easily. Of everything on my car, it went the smoothest and with the least fight despite never having been touched since the car was built. My car isn't quite as old or rusty ad yours but it has a lot of mileage and saw some winters prior to my owning it.

I also have a full, excellent condition power rack (lines included) that I have no need for anymore (manual rack conversion in process) that I would let go for very little.

Sad to see this happen but we (collectively) have the parts and the knowhow to fix it if that's what you want.