What do you mean by not having Internal Release? It is cross class skillable for DRG so there's no downside in using them.

DRG is my alt too, my 2nd battle class that I level til 50. I have no problem using just one cross-bar for my full DRG rotation. This is because I put macro on Buffs, and I actually have another reference cross bar only to see which buff has gone back online.

My cross bar is:

L2 Directional:
Heavy Thrust
Impulse Drive
Disembowel
Chaos Thrust

L2 Face Buttons:
Phlebotomize
True Thrust
Vorpal Thrust
Full Thrust

R2 Directional:
one Buff macro (weave this in-between your attacks, it'll run the next buff after you press it once etc)
Life Surge
Leg Sweep
Second Wind

R2 Face Buttons:
Jump
Spineshatter Dive
Dragonfire Dive
Ring of Thorns

This enabled me to cycle through the 24 move main rotation easily. No need to switch or anything.