We all know that CAD stands for Cathay Aviation Department, I doubt CX will have any trouble with the P2X issue, I'm more worried about the CAD saying yes with a P1X pilot you can go 3 crew long haul or whatever else CX deems P1X can be used for.
If we can go with Capt, F/O and two P2X S/Os now, looks like the P1X is ripe for Capt, F/O and one P1X S/O or cruise pilot or whatever else they'd like to call it.