I’m not sure if it works with zips or not. You might have to edit some information to match your theme. I just made ngp + color = ngp, same as wonderswan, i didn’t separate them since i was just testing it and setting it up for the first time.
edit: if you need help setting it up separately just let me know
You would have to edit the system.cfg, make a another rom folder, and add a config with in the opt.