See here how to pass safetynet.
Yes 5G should work with NR, go to Setting-> Network & Internet --> Mobile Network --> Preferred Network Type. The last option works for me. You can also disable VoLTE one level above, but I don't think that it is needed.
* Your warranty is now void. * * I am not responsible for bricked devices, dead SD cards, * thermonuclear war, or you getting fired because the alarm app failed. Please * do some research if you have any concerns about features included in this ROM * before flashing it! YOU are choosing to make these modifications, and if * you point the finger at me for messing up your device, I will laugh at you.