For what it’s worth, two other people have already implemented this concept; one for fe6, and one for fe8.
I think minimum Hugh is a bit out of place in this list. He’s just kind of okay, but he’s not, like, unusably bad.
Lyn mode Wallace is stellar in the context he’s in (Lyn mode) and doesn’t really fit Seth’s archetype. I’d maybe substitute someone like b2 Samson in for him.
A, uh, large portion of these units are Arachnean, with only token representations from other games. Perhaps it’d be best to embrace it and narrow the hack’s gimmick roster to be solely bad/mediocre Arachnean units?