This might be a dumb idea but would it be possible to just lift the scene of Rey watching the ship liftoff in the TFA trailer/TFA and use that as Rey’s parents leaving? That way, you can have two different ships for Ochi and Reyrents.
Obviously, that would also mean you’d have to cut out the scene from TFA as well (although with the clip I’m linking, I think it’s an alternate shot anyways so it might work without having to cut anything).
The clip in question: