I have tried placing
JPSS over vinyl and was unsuccessful. I have however been able to place vinyl over
JPSS, but not vinyl over Jet Opaque paper. The vinyl will adhere at first, but it comes off with the first wash and dry.
There is a printable vinyl for stickers and such that can be used with pigment ink. I don't know of a printable t-shirt vinyl for clothing though other than using an opaque paper.