Be Careful Graybeard!!!
Be careful Graybeard, what you think of as a loophole may get you in trouble. You may carry a gun concealed during archery season, but if you use it to kill anything, including hogs, while you are bowhunting, then you can be fined.
Also, although Ray Roberts WMA is LEASED to TPWD, it is still federal land under the jurisdiction of the US Army Corps of Engineers. As such, carrying a concealed handgun on the property is illegal. Federal regulation trump state regulations!
I am an employee of TPWD and I can attest to the above.
Todd