This guide has been updated to provide details on optimal mapping for Creativision. I went to the controller overlay images and checked every button used in every game; the suggested mapping should make all games playable except Music Maker, which requires a keyboard.
I'll try doing the same for the Arcadia-2001, but it used way more buttons way more often. Football, for example, uses all 12 buttons on the keypad, and some of them are contextual.
Done and done. GitHub isn't nearly as scary as I had imagined. I hope to work my way up to a script module submission when I have some time to learn a bit more. For now, I made some small revisions to my previous Astrocade artwork to make everything read a bit more cleanly.