Id imagine it wouldnt be too hard pats. Most taxidermists are experts at fixing damaged potential mounts.
Id guess the easiest way would be to put screws up through the skull plate into the bases of the antlers, adjust em, then maybe put a little epoxy around the bases under where the hair line would be. Might be hard to get the spread exactly down to the original specs, but could probably get close nuff.
Imagine it would be possible to mount even without the skull plate, with some sort of mounting block in its place. Think ive read of mounts being done with sheds.
Though if i shot a 170" buck and the antler popped off, Id probably crap myself.