Update to the journey in hopes of helping others:
I got an Arca Swiss MLOK plate from the 'zon and and had this rifle set up on it
But I ended up ditching that entire upper and didn't want a plate dedicated on the upper I replaced it with. Furthermore, I wanted the opportunity to clamp other rifles in that don't have provision for plate mounting (hunting rifles, kids' .22's, etc). So I ended up picking up the BOG Clamp unit I linked earlier in the thread:
That thing is a sack of hot garbage! Their Arca Swiss plate was out of spec and the clamp would slide out of the Arca clamp. I added a strip of grip tape to each face of the plate and it solved that problem, but even so, the clamp just had too much play in it even with a rifle tightly clamped. Basically you couldn't move the rifle to the target and then lock the ball head. The clamp had enough movement in it that you'd have to basically over-shoot the target, lock the ball head, and then let the rifle settle back onto the target. PITA!
So I ditched that clamp and picked up this Sunwayfoto unit that appears to be a clone of the Really Right Stuff unit, but for the same price as the BOG unit. This thing is rock solid and makes me happy. This will do everything I need and want a rifle tripod to do for me. Not saying this is the go-to for a dedicated PRS rig or anything, but certainly much better than any of the tripods marketed at hunters and recreational shooters for a fraction of the price of a full RRS setup.