I really did mean that as a joke, but occasionally even the blind monkey finds a peanut!

Seth,  did the custom shop give any reason why they would not make them?  It would seem the setup for the manufacturer would be a no-brainer. The pattern for a stock A-C flag is really no different than a standard naval semaphore flag (specifically, the letter "O"), with different colors, of course.   I can understand them having more of an issue with the gadsden, since the setup is a lot more complicated (though it looks great).

Or is this purely a materials issue?

[hemp]

Possibly even better than cotton. That is my only hint. =)

Better than cotton (more durable, longer lasting)?  Classic (usage dating back into history)?

You found a flagmaker that works in hemp?