I'm temped to try to do something like https://shkspr.mobi/blog/2015/11/raspberry-pi-zero-hidden-in-an-xbox-controller/

The one tweak I would make is to solder the micro USB cable to the controller rather than splicing wires.

But then I have to remind myself of the number of other projects I have in progress, the number of game systems I already have (not to mention a very nice 27" iMac which can also handle emulators), and that I'm mostly playing Minecraft anyway!