I have the Wheeler and the Viper, both were around $50 when I bought them, which was within spitting distance of the cost to build them myself, let alone realized labor value. I also have one of the action wrenches like pictured above - forget who made it, maybe Wheeler, but I can’t think of the last time I used it. I lust after a SAC modular vise, but I always have other projects which take my fun money focus away from it - it’s in line behind an AMP press.
But to be honest, for Savages, a barrel nut wrench and an Action Rod is about as handy as it can get. Clamp the barrel nut wrench in a standard vise, run the barrel through it, stick the rear-entry wrench into the action, bob’s your uncle, easy peasy, and no opportunity for your barrel vise to slip (of course, if you have a smooth barrel nut, the nut clamp can still slip, but that’s unavoidable).
Don’t overthink the bench - sure, we need something which can withstand ~100ft.lbs. of torque, but that’s really not so complicated. I’ve removed and installed dozens of barrels with either of those vises above bolted to a Black & Decker Workmate portable/folding workbench. I keep the vises in a toolbox under my bench with a set of bolts and wing nuts, I slap it on the Workmate, use a cheater bar on my torque wrench, and I never break a sweat. A lot of guys use Inline Fab unimounts, it’s just not THAT much force when we’re talking about the actual strength of steel and wood.