Probably not with an examiner i would think
as the OP is recently qualified and has mostly flown the C152, they're hardly likely to have managed multiple successful tests in a PA28?? Much more likely to have been with an instructor who doesn't know how to get their students to log flight time properly
.
If we're not talking about a multi-crew aircraft, so not a PA28, then the only time PICUS or P1U/S or P1/S, whatever you want to call it can be used is;
Pilot undergoing any form of flight test with a JAA or CAA Authorised Examiner....(enter holder's operating capacity as).... PICUS for successful test. Enter time in ‘P1’ column and have it certified by aircraft commander.
From LASORS, section A, Appendix 2
PS Dr Darcy, this isn't a criticism of you, but of FI's who should know better.