Hey! Could I be added to the list to help? I have and would be willing to use:
Meiko V3, Kaito V3, Miku V4X(+English), Rin/Len V4X(+English), Luka V4X, Kiyoteru V4 Rock/Natural, Gakupo V4 Complete, Gumi V4 Complete, Avanna, Prima, and Tonio. (I'm not quite confident enough using Dex and Daina to list them yet. Forgive me!)
I can do F+R, and I can take on two at a time. I'm on here regularly, so I'm easiest to reach through a PM!