Since its been a year since we've heard anything, I'm pretty sure the project isn't still kicking.
I find myself in a frustrating situation. I've got enough experience with audio stuff to handle this kind of thing easily, as well as quality mics, software, friends and acquaintances who are LARPing cosplaying dorks who will want to act, etc. but I don't have the Japanese skills needed, nor would I want to be involved in making the scripts, or making a usable game out of the recordings.
Rather than having all sorts of people managing their own situations in a dozen locations across the word, it would be much easier to have one person come up with a recording script that is properly timed and matched to the original files, and then just record all the shit in the same place on the same day to keep things from getting scattered and stupid. This way the audio would be properly normalized, organized, and ready to go for whoever builds the ISO back together. If I know what to record, and exactly which clip to match the timing to, I can get that stuff done. I would also need the OST.
So...yeah, I can work with something like that.
The Sorry I Have to Be a Dick Disclaimer: I'm giving fair warning to anyone else involved, I'm willing to spend time on this, but not waste time on it. I have no interesting in being involved with a failure, so before anyone fires up this seemingly doomed project and wants my services, please have your shit together, really together, before you contact me.