I just bought a used Fujifilm X70 in an attempt to save on space and weight. To keep chasing that goal, I made another change. Neck strap -> wrist strap -> finger strap. This is my take with the material I had lying around. I trimmed a simple velcro strap from some knock-off go-pro kit, and fitted it by trial and error:

Comfortable, adjustable, and surprisingly secure.

The X70 was actually bit misguided since it’s about the same size and weight as my previous Olympus EM-10 body anyways, and adding a pancake would likely have had similar results. But the EM-10 was a bit busted and I wanted something fun for traveling so it fits the bill. The GR2 is likely next!