The japanese FFVIII PC version already includes freshly made hi-res font textures because this is first time Japan get a PC release of the game. The Tonberry mods might work but probably needs some tweaks.
Thanks for all the replies guys.Turns out the mods (whatever ones exist) working with the Japanese version is the least of my problems. I can't even find a place to download the Japanese version being a foreigner outside of Japan. In case anyone is curious, they don't accept debit/credit cards from overseas to download from their store.I appreciate all of the feedback though!
I would be very interested in upscaling the Japanese version. I wonder what textures have been done vs. what haven't...If you get a copy, let me know - you could be integral in helping us get this ball rolling.