I would like nothing more to see the shitfest that steve, faye and maybe pintsize would give marty for it.
Considering the amount of shit that Faye has put Marten through; drunken headbutt to the nads, numerous punches to the shoulder, drinking herself into a hospital bed to name but three occasions, Faye giving any sort of shit about Claire would be hugely hypocritical and against her character.
Same with Steve, with his close call with jail with his first girlfriend in the comic, the coroner girlfriend who dumped him and married her ex in the space of a panel, and Cosette, Northampton's answer to Inspector Clouseau, would reek of hypocrisy if he made any sort of trouble about the fact that Marten's girlfriend happened to be trans. If anything, Steve would be like "Eh, my best friend has a girlfriend and he's happy. So I'm happy. Let's go drunken sledding again!"
Pintsize.....okay he might say something. And probably end up taken apart and dumped in several locations around the apartment. Or worst case scenario, sent back to the Companion organisation.
In the end, I think the ones closest to Marten would just be happy that Marten is happy.