If it ends up being hardware from Nothing, I'm hopeful for full compatibility with Cape cellular:
TMSI switching is supposed to be available for regular customers who aren't on Obscura (i.e. nonmilitary users on regular hardware, with GOS already being compatible) later this year, but that tactic seems of limited use when it isn't paired with the IMEI spoofing enabled by the Obscura phone. Changing the IMEI requires an API call which is custom baked into Cape's Obscura phone hardware. Since Nothing already knows how to do this, they could that feature to a GOS handset. [Take my money 3x!]