I use a lot of off-meta melee (if there is such a thing, since most melee can be made powerful). I guess the ones on my list that count as “mediocre” are Mios, Ninkondi, Prisma Dual Cleavers, Guandao Prime, and Twin Basolk. If we’re counting hidden gems, I’d also add Caustacyst, which I liked even before I had a riven for it, and now use on my Kullervo loadout as well.
That’s really cool (and involved)! Thanks for writing that up. I hope you get a chance to actually try it.