How about this:

Tripod + RD4 + R10. Lens ring mount clamp

Monopod + R10 + lens ring mount clamp or monopod + arca base clamp. Swap out the R10 or arca clamp as needed. If using a lens that has a tripod mount, unscrew the arca clamp or R10 and screw the monopod directly into the lens.

Putting an arca clamp between the RD4 and the R10 just violates the laws of photography!