I've successfully ported my save from my vita over to classic. You need to use memory card rex and CWCheat on the vita to port it across successfully.
You also need to rename the file extension of the save. I can't remember if there was a guide or if I just looked at the saves they both used and figured it out myself, but from memory it was open both the vita save and the mcr file. Inject the vita save into mcr. Save mcr. Copy MCR to usb and rename it to the correct format.