GrapheneCt has released a PS Vita kernel plugin that provides an API to run Toshiba MeP code on Venezia, here is a quote from the source:
Kernel plugin for PS Vita that provides API to run Toshiba MeP code on Venezia. It supports execution of MeP ELFs directly from userland-allocated memblock.
Original idea from PS Vita Henkaku wiki article.
VVNZRunner provides safe way to run MeP code on Venezia processor and functions to transfer data from and to Venezia SPRAM.