You know...I know nothing about programming, so I don't know what's possible and what isn't, so I'm just gonna throw this out there...
You've got this TF program that is specifically for hacking CT, and you've got a bunch of skilled or semi-skilled programmers on this site or within the reach of an e-mail...
Why can't you just eliminate the 8th character altogether and create another character slot using an existing slot? After all, you can put Ayla in Crono's place, and play as Ayla for the first half of the game...why not just duplicate, say, Lucca's character data and substitute different sprites. It's more complicated than that, I know, but couldn't you just use existing data and modify it to CREATE another character slot, instead of attacking the glitchy 8th?