Dave, the barrel dimple tool might have some use around here, but since I mostly run A2 front sight posts on everything I own, it would be rarely used.
I would tend to stick with an uppers configuration as is or buy a barrel that has the features I need done at the source.
That said, I did just have to fix my son's Sabre Defence upper after he replaced the front sight and it started short stroking because the gas block had moved out of position. In this case I put the original front sight back on and fixed the problem.
The taper pin tool would be used even less and after I buy the drill and reamer it costs too much to just site idle.