The 12 analog inputs of the UFX and 802 have absolutely no relevance when connecting a 12Mic.
If you talk about 12 ports I think you mean the 8x analog I/O and 4x Mic/Line/Inst ports.
If you look to the 12Mic then you can clearly see, that it has no 12 analog outputs.
So everything needs to be routed digitally through either ADAT, MADI oder AVB.
You can use the 2 ADAT ports of 802 or UFX II, then you can use the 12 Mic inputs of the 12Mic fully at single speed. If you should work in double speed only 8 ports of the 12 will be useable because of the known port multiplexing / bundling for double speed.
If I were you I would use the UFX II instead of the 802, because
- 802 can not store its mic settings digitally
- UFX II and 12Mic have very similar Mic inputs supporting 75 dB gain.
BR Ramses - UFX III, 12Mic, XTC, ADI-2 Pro FS R BE, RayDAT, X10SRi-F, E5-1680v4, Win10Pro22H2, Cub14