I didn't see the MacOS nwjs universal app binary available yet, so I created a tool that can combine two c3 MacOS arm and intel exports into one fat binary. Don't package the C3 nwjs exports.
FOSS tool - so C3 could integrate if needed/wanted.
github.com/MikalDev/fattennwjs
Develop games in your browser. Powerful, performant & highly capable.
Added optional functionality to codesign the fat app (tested with adhoc signature).
We found that on ARM MacOS codesigning is needed to correctly handle permissions.