Interestingly on this thread, our own Bellerophon considered the Trident yoke to be better designed than that of Concorde:
Concorde Style Yoke — Tech Ops Forum | !!!!!!!!!!!!!!
I can't see any "press to talk switch" inboard though. It would make a lot of sense if the outboard button was indeed the "press to talk", because if one were using the yoke one-handed while operating the panel with the inboard hand, there'd be less chance of inadvertently knocking the inboard selector switch.
Regarding conversion, remember the Trident was designed in the late '50s. Ergonomics was in its infancy and commonality across types was practically unheard of!