How to deal with AD when deploy Hyper-V cluster?

Solution 1:

The main idea was to create Hyper-V cluster that's not connected to office AD servers so even if office goes down for a long time services in datacenters should stay alive.

What is the logic behind that give nthat "AD servers goes down" is a non issue if 2 of them live on the cluster, AND the cluster since 2019 can live and start without AD?

and I don't want to host AD controllers as VMs as it kills the whole idea.

Nope, it does not. It follows best practices.