As far as Time/Tig goes:
It does not take much to zap a handle to a bolt. I do however feel that actually fitting the primary extraction cam has more to it. Namely because Remington PE cam surfaces on bolt handles went through a big change (for the worse) when the RR prefix receivers came online. The cam on the bolt is wrong. Take a new RR action and compare it to almost any other of earlier lineage. The cam angle and duration is quite different. That leaves two options: You weld it up, remachine, reinstall, or you replace it with an alternative.
LRI does both. Several years ago I built dedicated fixturing that allows us to restore a current production handle to the proper geometry. To do this it absolutely DOES require that the action be provided because they too have some variance.
edit: x10 if your action has been "tuned", "accurized", "blueprinted", "trued", etc... because machining the lug abutments on the receiver and the bolt changes everything. Understanding this is the difference between an action that runs to standard or one that is both anemic on the PE and short on striker travel.
I have the metrology to prove this. That investment in equipment is what lead me down this path to begin with. It's the genuine attempt to solve the problem. Sticking a handle back on so that the bolt lugs are 6 and 12 is only but a small part of it.
If other shops are going to this length then good on them. If they are not, then you did not get what you think you paid for.
C.