Converting PSP save files

So, I've been playing Disgaea Portable for a while (the JAP version) and I decided to read up on the US release one and turns out it's going to get some extra features like multiplayer, and you can turn off battle animations (anyone who's played this series can tell you how useful that is.) Not to mention that I could read the US version. Problem is, I've done a lot on the JAP one already, 80 hours worth of gameplay, and it would suck to have to start all over again. I really want to be able to convert my JAP save to a US save, but I've found no methods for it so far. If anyone knows a way, then please tell me. It's either that, or I'll have to use CW cheat to bring my US file back onto par with my JAP one, and that's if they have the codes I need.