So I had a little time on the weekend to "customize" the USBC to HDMI adapter.
First, I carefully removed with a razor blade the cable's strain relief area careful not to cut into the cable's sheathing material. I slid a 5/8" thick-walled heat shrink tubing over the USB end. Got my heat gun and carefully heated up the tubing so that I could bend the cable in the exact position I wanted to clear the PL mount "ears" on the Pixis.
Next, I needed to make it a screw locking cable. Luckily I had a broken locking cable to scavenge the screw and the small plastic extension from.
First, I measured using a micrometer the distances from the bottom of the USB metal connector to the top of the screw centered on my old Blackmagic locking cable that was broken. Then I carefully cut the plastic "extension" used to hold the screw and test-fitted the screw/plastic extension on the HDMI adapter's USB-C plug and determined how much I needed to shave/file off the plastic extension to match the height of the original screw location.
After getting the height right, I crazy glued (using quick set spray) and test-fitted the cable/screw on the camera. crazy glue doesn't work well with heat shrink but is good for test fitting before it releases. After I was sure I had the right position (1st try worked because of all my measuring), I then heat-shrunk the screw/plastic extension into place.
Here are pics of the final cable and the heat shrink I used. Ignore the quality of the pictures, I was rushing in a room with very bad light to do a final test of the cable.

- Customized locking USBC to HDMI for Pyxis w/PL mount
- IMG_2602@0.5x.jpg (709.18 KiB) Viewed 1669 times

- Customized locking USBC to HDMI on PL Mount Pyxis
- IMG_2603@0.5x.jpg (865.09 KiB) Viewed 1669 times