Omarchy works on M3 with GPU acceleration.
Omarchy is not something I'm comfortable trusting long term, and comes with a lot of cruft.
I'd be very interested in seeing the parent post's project get M3/M3 Pro support; have it working in my system with a patchset on top of Asahi but suspend is leaving a lot to be desired. Unlike Omarchy, the parent post's diff would also be much more reviewable due to it's more limited scope.
Omarchy has no chance upstreaming any of their work, the code is abysmal.
Asahi at least guarantees the quality of their stuff because they upstream everything, sooner or later. Gravity apparently also intends to be upstream-first.