Not a problem if you have the ability to machine it; your take is spot-on.Building your own barrel vice could present a challenge. The clamping force required to keep a grip on factory barrel while breaking the action free, is significant.
I pull a lot of milsurp barrels for replacement- 2" aluminum stock, 3/4" Grade 8 all-thread/nuts. Crank on it with as long a cheater as I need.
It's all about surface area contact. If the barrel has a straight cylinder ahead of the receiver easy-peasy. Little or no straight cylinder, with a lot of taper (like Tikkas), are where custom bushings, tapered to match the barrel contour are desirable.
Mine:
For a commercial vise, I'd go with the Brownell's. Every bit as stout as their action wrench which is indestructible.