A-bolts unscrew just like any other of the 'major' bolt action rifles. You can talk to MidWest Gun Works or Wild West, to name a couple that do such work (or at least they did before the mad rush in recent times). Browning uses a tighter thread than most, so it's easy for the ham-fisted, get-a-bigger-hammer type of 'smith to screw them up. No good reason you can't do what you're talking about, though it'll be tougher to find support if you need a 'smith locally or something.