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I think your friends at Canon can help you out with that video rig problem.
(Image 1)They have just introduced the CINE-SERVO 17-120 T2.95 lens with a removable servo drive unit. You can have the best of both worlds, standard ENG style servo controlled zoom and focus or remove the drive unit and use a Cine style rig. Note it is available in PL or EOS mount. This would be great for a shoulder rig.
It seems that the Cine side of the coin is just now discovering what they are calling Run-N-Gun which is nothing new to us TV people, we have had the handgrip servo zoom for ages. Makes a nice way to hold the camera and zoom with one hand while the other can operate the focus.
You have to have the offset mount viewfinder so the camera sits on the shoulder and is balanced with the "Zoom" hand while the VF is at or in front of your eye.
(Image 2) Or you can really go all out with a full on Cine style lens with add on remote controlled motors for Zoom Focus and Iris. Shown here on the Canon 14.5 -60mm mounted on a C-500.
(Image 3) Need something longer? How about the 30-300mm rigged with remote motors. You can see the remote zoom control at the lower right. And once again under all that other "stuff" is a C-500 rigged out for studio shooting.
(Image 4) A lovely combo monitor SSD recorder with all the bells and whistles. OLED screen, Waveform, Vectorscope, Dual slot SSD recorder. I-Phone and Android remote control.
Please note that it is available with PL or EOS mount