They're really not that hard to pull I'd never removed a bolt gun barrel before doing Tikkas and I've done three without an issue. My local smith said the same thing yours did I don't know if they just say that to prepare you for worst case or just don't want to do it. Barrel vise and action wrench are like $175 and you could sell them after you're done if you want. Plus you will have a barrel to sell or keep for another use.
So I got the damn thing off! Read all of the posts on there, got a mechforce barrel vise from amazon and the Wheeler #1. Let the barrel soak with Kroil Oil for a few days, barrel pointed down to allow the oil to penetrate. Synched down the barrel in the vise with drywall tape and resin, synched the wrench down on the action and two good hits with my impact hammer and she spun off... took all of 5 minutes! (Post the soak, of course!).