As I understand it, the GOM law concerns only fishing with natural bait for reef fish. J hooks are legal with jigs or flies when not attaching natural bait.
Texas is unique in that it also has state laws for state waters. I have not seen the regs.
Interested though, perhaps post on 2coolfishing.com
I do see the special reg requiring circle hooks for Red Snapper.
http://www.tpwd.state.tx.us/publicat...its_saltwater/
I figure that would be end of story.
Easy to rig circles for any application though.
A carolina rigged fly on a circle would be a great experiment.
Best of luck!