Having read the thread a few times, I cant see any remarks on the case of a person holding a restricted FAA PPL (on the back of an ICAO lic) doing review flying and converting to an FAA only PPL.
Also for the case of a person holding an ICAO IR getting a FAA IR.
In both cases, the person is current and licensed, and is not gaining any new skills. Cant figure if this case falls into Cat 3 or Cat 4 of TSA stuff. Cat 4 would make the most sense !