I was wishing for the same for my HMC150 and found that the shoulder rig I use for my DSLR works great with the full camera. In fact, I put a focus ring on the lens and my follow focus works great. I also have a zoom/focus iris controller that mounts to the handle. Most suprisingly, the eyepiece happens to line up perfectly!
I am planning on trading the Panny for the XF300 later this year so hopefully the ergos aren't too different.

If you shoot both DSLR and camcorder, I'd try it!

Hi Robert,

What model shoulder rig are you using for your DSLR and Panasonic camera?

(I'm hoping you'll say,"Oh it's the really good one that's under $200" :)

Cheaper than most as I made a few pieces and sourced others from lesser known manufacturers.
The rails and riser are red rock with a couple of other pieces added on. It is a single handle and has an adapter to mount to a tripod that also fits my monopod. I'll take a couple of pics Thursday while I'm on my shoot.