@blobyoumu Progress: I was missing the udev rules needed. When I last looked at it, I learned that Alpine doesn't use udev, and confirmed that online.
Except this time, I'm using udev. So I put in the rules, rebooted, and exposed two mistakes: 1) Didn't fix the group, 2) rebooted system instead of udev service (the file was gone after reboot).
But it's still not working in Fantasy Strike. I think this is because it can't open /dev/uinput for writing. This is because that doesn't exist.

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