So some further experiments with with other character combos, but I have to preface them by saying that I think Decanter is right and it can't be done without editing character stats.:
Per Videospirit's suggestions:
Simon w/ Tormented Shield + Varia + Ginasta + Qum using Arousing Aura:
About as effective as the loadout for Simon + Varia + Vhala + Ginasta as Qum increases the damage output and of the other three about as much as Ginasta lowers Fuzkao's Defense. She also keeps the party standing, but her lack of an ability to do damage is a problem. You can get away with sticking the crusader mail on Varia with this party (not that it helps much.)
Simon w/ Tormented Shield + Varia + Vhala + Qum using Arousing Aura: The lack of Ginasta's Debuffs isn't really offset by Vhala's additional damage output.
Simon w/ Tormented Shield + Varia + Vhala + Robin with maxed MAG:
Effective as long as Fuzkao doesn't target Varia 1st turn, which is actually also true of Simon + Varia + Vhala + Ginasta
Also rans:
Hilstara: Aegis Assault doesn't do enough damage to warrant her inclusion.
Nalili w/ Tormented Shield: Basically only able to use attack in the 1st turn, see below for her remaining skills on turns 2 & 3.
Nalili w/ Buttplug and pre-fight lust draughts: Blade of Lust does sex damage which Fuzkao resists. Her physical damage skills are too weak.