I-M,
Whilst I hadn't (and subsequently didn't) graduate(d) from TPS, what you describe - including liaison, reporting, managing is certainly what I was doing under the job title "Trials Officer" at BDN, and have met many people who are not TPS graduates doing that around the world. We called ourselves FTEs. My then boss once described the point of TPS as making an FTE very experienced, very quickly - which it certainly did.
I'm pretty certain that a majority of SFTE members are also not TPS graduates. Their requirements for
Member don't even mention TPS as an optional route to membership.
G