I don't know why I didn't think of this earlier, but I just a had an idea to get, more-or-less, what I was hoping for.
I install your hoodless/maskless flowing robes mod, add a mod that adds Revan's mask as a wearable item (BOSSR for example), but I give the mask the disguise property. No mask=no hood, but that's something I can live with. I just wanted to have the hood when I wear the mask, but be able to see my character's face if I take the mask off.
Now, this means that wearing the mask will always mean that my character is wearing the full Revan getup, but I don't typically wear Revan's mask without also wearing the robes, so it wouldn't have much impact on me.