Link: https://www.remapper.org/

This clever gizmo turns any USB input devices - or combination of input devices - into any other HID device. Different versions also accept individual switches as inputs.

This means if you have trouble using a mouse, you can turn a joystick or a gamepad into a mouse.

Or if you can use a mouse but you can't click, you can remap the button to some other switch, like a foot pedal.

The possibilities seem endless, but it is a bit on the geeky side. If you're not the technical type, you might want to get some help from a computer or electronics engineer to put together your ideal setup with that one.

Check out the manual's section on accessibility:

https://www.remapper.org/manual/#accessibility-applications