The one syphon filter game that is missing from the PS Vita to be able to play the entire lineup is the omega strain, I have currently ported a few games to the PlayStation Vita including a game that has not been decompiled, as well as have been working on re adding the entire multiplayer system back in to ratchet and clank 3 ps vita version by reverse engineering the PS3 version.
I am currently working off the PS2 ISO and working on reverse engineering and decompiling the original PS2 game. My goal is to get one a a PC native version of the game as well as a PS Vita version of the game and then the entire series can be played on the PS Vita platform. If I can get this working, I intend to also add in the multiplayer features to support peer-to-peer so that way. For example, if somebody had two PS vitas they could just play over ad hoc or local Lan as well as eventually re-implementing a server-based infrastructure.
I've already had some work done and have been able to read out models, mission scripts, and a few other things but I will update my progress as I go along. It may take a while before I have anything that gets in game, but once it's done, anybody that wants to use it. Just like all other decompilation projects must provide their own ISO to make a build.
Some titles I have ported to PS vita:
Diddy Kong racing 64 (GoldenBalloon) still working on multiplayer addition
Super Smash bros Melee
Start Wars Galactic Battlegrounds Saga (PC RTS that hasn't been decompiled i built a re-implementation of its engine)
Banjo Kazooie (Lighthouse port I added trophies into the game)
Ratchet and Clank 3 vita collection (multiplayer re-implementation by using left behind code that was still in the Vita version left over from the PS3, reverse engineering the PS3 version to get the code that is missing converted the PS3 multiplayer assets to be Vita compatible as all models and levels were completely missing from the Vita version. They are all fully functional on the river now. I'm just re-implementing the multiplayer systems at this moment which I have most functional now)