Good luck with your project! It's always nice when people share the information they got and help the whole RH community. If you succeed in completing your project, it'll be a great joy for the whole Suikoden community around the world (assuming that most of them is at least able to understand English).
I was also happy to read that their tool is able to export the PSX script and import it into the PSP version. This way, if my team does translate the PSX version into Italian, we will hopefully have an easy time converting our translation to the PSP version and, at that point, translate Suikoden II too. Which, actually, was officially translated, but it's one of the worst Italian translation I ever saw when dealing with videogames, so it does need to be remade from scratch.
And, of course, merci beaucoup to the French team!