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I use my phone to emulate old games, but using the touch screen for input hurts my fingers and gives me cramps.
Is there a way for me to connect my phone to a computer then pass input from a keyboard or a joystick attached to the computer as if I had connected them directly to the phone?
Yes.
This app is open source (but old and limited in features), provides a web interface to use in your computer browser over the same (W)LAN: https://play.google.com/store/apps/details?id=com.marcosdiez.keyboard.latin
There's other apps to remote control your phone that are more capable (but not all are open source);
https://play.google.com/store/apps/details?id=com.sand.airdroid
