I came across a stream randomly of someone playing this on FC2 live, where they were in a boss fight with Seymour, this one specifically near the end of FF 10:
I counted about 5000 HP even though it shows only 900, it would keep "underflowing" from 000 to 999 a bunch of times (in the screeshots below)
I searched everywhere I possibly could. Google, youtube, the streamer's own blog linked on the page description, insane difficulty forum, romhacking.net's own list of FF tactics romhacks. Found nothing period anywhere.
I at least got a couple screenshots of the mugshot pictures before the stream ended when he finished this battle but that's it. So i couldnt see more.
Tidus Mugshot, Kimari sprite:
Seymour's 4 element discs just like the FF10 battle (on the sprite)
Also lulu sprites at the top barely