There isn't really anything available for this phone so I prepared a simple case.
Can be printed in hard or flexible material.
Optional: Hole in the back to be able to attach a pop out finger holder (need to disassemble them to squeeze the rubber through the hole).
Optional: Thin version that makes the buttons more easily pushed (I prefer the depth of the original),.
Optional: Version that covers the essential button entirely (untested).
Note that the version in the photos has been slightly updated to better align the holes on the back.
The author marked this model as their own original creation.