I've seen a few Heavy Armor head pieces that fit under the hood on the imp side, but are there any on the Rep side? Been looking on the GTN for awhile with no luck, but I perhaps from specific quests or something?
If not, you should definitely have options on the Cartel when 1.4 releases for stuff like this. Not specifically, but something similar to the Revan mask, maybe?
A bunch of people with the actual mask would be lame & ruin it's iconic status, if you ask me, but I really dig the style & could see similar pieces being highly sought after.