Following on about observations of some DB radios having independent PTT triggers that may or may not be extended to external mics, there are full dual transceivers (which look no different in display) to DB items, but each sub transceiver has total autonomy from the other unless the user or device setup has enabled a crosslinking of functions and shared access.
So whilst relatively uncommon, in some markets (meaning targeted user groups/services/roles) such radios aren’t so rare, but I’ve never known an example be generally marketed bar one that was in dev kit form (think of it as a cross between two ADALM Pluto’s built to pro commercial TA standards as actual radio kit not sig-gen/analysis stuff with an SBC/PL control module). But even that was only an attempt to offload dev kit systems on a system that never became viable.
But it’s still interesting stuff, and shows there are exceptions to the norm even if they exist in the shadows tech wise.