Well, you could always just use onscripter PSP since you can still sort of use PSP homebrew on the Vita on 3.6, but no there are no onscripter ports for the Vita as of yet.
No, I don't. You'd have to look around about seeing how to load PSP homebrew on a Vita.I'm sure this is the correct site to download Onscripter PSP, but idk how to compile it and use it.
Do you know any links or tutorial to compile everything, convert it into a VPK or something, and get the VNs running on the Vita?