Then why not going with a DSLR cage? (same seller and recommended) I bought one for 100$ in the late 2011. They don't seem to produce the same model I've bought though.
Then buy a simple shoulder pad and some handles and you're good to go.
edit: another seller is offering a very similar model of DSLR cage that the one I purchased last year.
Just in case you wouldn't be convinced, here's something that could do!
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You can configure it pretty much like you want:
My current setup is actually the opposite side (cage on the left) so I'm operating the camera with the right hand (with an external monitor) :
Or make one yourself:
Made using 3/8 aluminium rods. Rock Solid and works well. Not as convenient when comes the time to mount it and un-mount it on the rails, but once it's on it, it's solid.
For the few times I'm using my adapter, I didn't wanted to invest a lot in a rail system, so I made one for a few bucks (under 50$).