Hi,
Thank you for coming Microsoft Q&A forum.
Yes, we could move MBAM server to a new domain device, then we could get the existing keys from the device into the new device. Those encrypted PCs should still keep their status.
Here is a similar issue for reference.
Migrating a MBAM Server to a new domain
But for more information about MBAM, we recommend to ask MBAM support for help on TechNet forum, they should be more familiar with this issue.
Bests,