Just thought I'd chip in..

Firstly, based on my experience, the status on the bp is shown the other way around, meaning xxTP rather than TPxx. For example, a regular Krisflyer member who is a supp card holder would be KFTP. While an elite gold would be EGTP. lokijuh, I think you got the order wrong! Anyway, in this case, it might be more obvious to the cabin crew who welcomes you on board that you are a supp card holder as opposed to the principle card holder whose status would be shown as TPPS.

Having said that, I have taken a peek at those sheets of paper that crew use to write your name and take meal orders with and they denote Solitaires with a T next to the name, regardless of whether it's a supp card or principle card holder. So perhaps majority of the cabin crew do not know who is principle and who is supp after all. And as such I believe the supp card holders receive the same treatment as any principle card holders on board because the crew don't seem to know.

By the way, I believe an F priority bag tag is always used even if an F cabin doesn't exist on the flight. Only on Silkair flights do they give you a Silkair priority tag instead. But in all cases, the gold Solitaire tag is hung on as well.