CXDOG we’ve been through this before.
Yes the P2X rating was originally limited to 5 years, for good reasons by CAD. However it was asked at the time what could CX do if they wanted to extend that period.
The answer was to to upgrade to a P2 or P1 rating and fly the pilot as a relief co pilot on S/O pay. All refresher landings could be done in the simulator.
Whether that would be approved by the current CAD is a moot point