Hi Matthew,
Technically speaking, this *should* work … of course you would not be able to login using any of your AD accounts after the migration but you would be able to login using the SSO Admin account. Once that’s done, you can then manually join a new AD Domain and depending on how the structure of that AD is setup, you may need to manually clean up/update your permission associations. Again this is all theoretical and not something we see customers asking for, I definitely recommend testing this out in a lab.