Hacking PS4 <-> PSVita savegame on jailbroken devices, possible?

[SkyStruck]

I kind of like playing the remaster in my breaks and would like to continue them on my PS4 from time to time. Now, in the cloud they're all interchangeable, but of course when you have a CFW (Vita) and 7.02 HEN/MIRA, you're pretty much out of the loop. A downside to be sure.

Is there a way to still get this done or could I just copy the files from the PS4 to an USB and overwrite it with the PSVita save and copy it back?