I wouldn’t be shy about getting into Remake or Rebirth now. They both stand up as their own games (concise start/ending, somewhat distinct mechanics, each one is easily 40+ hours of gameplay). And with Part 3 targeted for 2027 release, I suspect this kind of overhaul would be outside their dev cycle to implement.

Part 2 is already using the engine from Part 1 with minor adjustments. I suspect most of Part 3 development is cinematics and world building.