Isaac sent me this:

I have made an add-on grip for the Panasonic GX80/GX85 camera. People on Facebook really liked the grip, so I have made a small website where you can buy it: https://ibd.murff.ch/gx80grip/?product=gx80-gx85-grip-free-shipping

The grip is better than Panasonic’s official grip because you can access the battery and the SD card slot while the grip is installed. Also, it is cheaper with shipping included.

The grip is NOT completely compatible with the GX9. The GX9 has a different battery compartment shape, so you wouldn’t be able to open it with this grip.