DNC,MCH,WAR,WHM,RDM. BLM has a lot but you can get away with not using a few actions. Machinist is definitely the easiest to get behind. SMN might be joining the Smooth Moves brigade.

I'm sure like most classes Reaper will function fine on just 2 hotbars. 32 buttons seems like the sweet spot.

It's just going to take getting used to. Especially since Blood Stalk, Swathe, Gibbet, Gallows, Guillotine, SoulSow, Hell's Ingress and Hell's Egress all change into different actions.

Only role actions I can see prominent use of in PvE is Second Wind and Bloodbath. Everything else is largely unnecessary given that Reaper only has 2 positionals.