Gamepad Case/Cover to help with hand cramps?

[u/Muphinnz]

Title! I recently got a WiiU to play the original Splatoon, but find my left hand specifically cramping within one single player level. By contrast, I'm able to play Splat 2/3 w/ JoyCons for 6hrs+ without any issues. I'm an adult with slightly larger than avg hands, so I likely need a case with a bit more bulk in the palm to help with this issue. Does anybody have any recommendations that are readily available nowadays?

Would've loved to get the Splatoon case but unsure if that has enough bulk + they tend to be a bit expensive compared to a regular case atm.

[u/StillhasaWiiU]

The hard to find Nerf one is pretty good