I was wondering the same thing and started poking around. Maybe I'll find somthing
Wouldn't the abridged Star Door 15 for this port pose a problem if you're just doing a simple file swap?
Though apparently the offending pictures are still in the asset files on the ISO, even on the Vita version.
I agree that would be awesome, and not unlikely. After all, the Ys Celceta Vita version's English text was fan-ported to the Chinese PC port, and even some people managed it for Ys 7 PC (which apparently has more debug rooms left in) but nothing for that one was published.