Swapping barrels is easy if you use the recoil lug designed for the accustock. I put a stevens 200 action in an accustock and the only change I did was to change the factory stevens recoil lug to a factory accustock recoil lug. I didn't think that a hunting rifle would be affected adversely by not having a custom ground aftermarket recoil lug. The accustock lug is shaped differently than the standard Savage-Stevens lug. It is slightly narrower from side to side and has parallel instead of tapered sides. If you do a search for the two on the Midwayusa web site, you can see the difference.

If you use a thicker recoil lug, or one with non-parallel sides, you will have to relieve the accublock accordingly. The wedge is not important, in fact Savage stopped putting the wedge in their accustocks after a while when they realized it was causing more trouble than it was worth. My only concern would be whether or not you are weakening the aluminum accublock sufficiently to cause problems. That would depend upon where and how you relieve for the new lug.