Ciao
A couple of years ago I migrated a Hyper-V cluster to Vmware vSAN consisting of a 100's of virtual servers. The only one I didn't migrate with the Vmware converter was the virtual domain controller.
We installed a new DC and migrated all roles
There was also a physical DC in the infrastructure which remained like this (with a Hyper-V cluster it was recommended to have a physical DC)
So from my experience I recommend creating a new one.
