Can't thank you enough for your efforts - I had pre-ordered P4G back when, in the vain hope they might release the Japanese audio as DLC, but in the end never played it more than 10 minutes due to the painful dub, and its just been sitting on my shelf gathering dust ever since.
I played the majority of the original US release on PS2 almost 10 years ago now (despite the pain - at least it came with a soundtrack CD), before discovering its undub, stopping, and starting a new undubbed game on PCSX2, only to never finish it due to replay fatigue. Then after P4G came out, I couldn't get myself to play the PS2 version knowing there was an enhanced version, but couldn't do P4G because of the dub. So, in the end, your undub will be my first full P4 playthrough.
I had pretty much given up hope of ever finishing it, since learning written Japanese is taking me much longer than spoken, and I figured the Vita would die off before anyone hacked it. Glad I was proven wrong.
Now to finally play P4G. Thanks again!