Astronomer Class (Optional 100% Rate for AoE Statuses): Well made visuals, interesting Sun/Moon status buffs that could give pyrokinetic and hydrophist a new feel while also giving them a brand new theme to go off of.

Chronomancer Class: Personally prefer this over Astronomer however both are similiar. Brings in a new necromancy skillset that is about speeding up the battle, or slowing it down.

Guardian: Another class mod that could help bridge a "gap" for characters going Str / Int while keeping a melee feel.

Initiative Based Turn Order: Does exactly what the name says.

The Venalguard: Str / Int class that is about afflictions, hexes, stances with dual weapons, and having a "Earth" or "Crystal" theme.

Priest to STR Overrite: This might just be personal preference, but allows allies who are up close in battle have a panic heal for you and party members, or some minor utility.

I know some of these might just not be what youre looking for, or what you intended the collection's outcome to be but these are just some that I found and used prior to strictly using your collection.
I did add these in fitting spots in the load order and the game worked fine but I did run into my friend having "different mod settings" than me which halted our playthrough. Not sure if one of these caused it so be wary.