Yes i don’t think it would be possible since they completely changed manufacturing of kinematic portal, changed overall size.
Agreed if they did a P3C upgrade kit from an X1C I would be very interested.
Would probably keep the H2C though and get a separate H3C.
From a parts supplier that works with BL. They are prototyping a high temp setup, no idea when/if it will be released. They have also been working on a resin/UV printer for a long time and registered trademarks in Canada related to industrial resins around the same time they registered lasers and 3D scanners, so its on the roadmap probably sooner than later.