Thats true now that you mentioned it theres a ps3 version that got Undubbed, which probably helped the Vita get the same treatment.Well, renaming does not work as expected, and i think that the only ones that achieved undub by "layering" are psvita folks, search on google or github a repository called Patch by OmniumArtium i cant link it because theres a mega link there, im just leaving this here for those who want so see what they're done, the file structure and files itself if you want ofc. Well im going to sleep .
Observation: Psvita version was built differently, i know that xP.