I thought about adding a dot to RDM but then SMN and BLM have dots so it'd be nice to have a no-dot option in the caster group. As something to maintain at least.
I'm currently in love with MCH and thought about this for RDM: What if your melee finisher changed Fleche and Contre Sixte into new melee abilities to be weaved during the combo (maybe in an order like the existing combo to add a new layer)? So, make sure Fleche and Contre Sixte were on cd before going into your melee combo, and then they come off to be weaved in melee. Maybe successfully using them before say Holy/Flare unlocks a new ogcd finisher. Something to spice up the melee finisher.
It could look like: Riposte > "New Melee Fleche" > Zwerchhau > "New Melee Contre Sixte" > Redoublement > "New OGCD Finisher" > Holy/Flare > Scorch (and Fleche could turn into the finisher upon successful completion w/o adding new buttons)
Edit: Okay, I'm now imagining the new ogcds being animated as red light sword attacks and it's making me excited.