Guy,
Using a ball head on a monopod can work, but it is a real PITA since you have too many things to fiddle with and getting the ball tight enough is always an issue. The monopod permits you to swivel and tilt any way you like as is, so a more secure connector of camera to stick is all you really need.
I do not know what the handstrap attachment points require, so cannot really help there, but RRS may even have an option for you there also. I would give them a call.
To work more as a walkabout, I even use a monopod pouch hanging from my gear belt. That allows me to shorten the monopod, tuck the end into the pouch, and be able to get a pretty steady platform almost anywhere. Not quite as stable as if the end were on the ground, but it is not bad if you are walking and shooting, like on the street or trail or something. It does not get in anybody's way. With my big glass, I use a neck strap tether to the lens, so that it does not get away from me if I accidently let go of things. That arrangement even allows me to let the rig lean forward so that I can view things on the camera back using both hands, or even to show others when chimping ;-)
LJ