I'm a touch late to the party, but a license, per se, is definately not what you want. Perhaps you are more interested in an association, or a society. Think of like the NRA, or the AAA, or AARP. Membership is voluntary, but has some perks.
I've spent the last several hours looking up various and sundry associations and societies, ranging from the Society of Decorative Painters, all the way up to the Sports Car Club of America. There seems to be one for everything.
My point is is one could be started here, by simply taking advantage of some of the infrastructure available. MetEd is free, some courses could be required for entry, or other qualifications. Someone could see about setting up discounts at Midwest hotels for card-carrying members, and a well-written press release (nothing scrawled on a pizza box or cocktail napkin) could be circulated to the LE and EM community stating intentions, mission statements, doctrines, tenet, philosophy, whatever.
Basically, it's a thought on how to express that we're serious, we do things this way, and don't condone that, etc, etc. So, please save the flambe remarks, it's just a thought, and it is one that would probably take a decent amount of effort to first get set up, and then to maintain. But any other group that wanted credibility in the eyes of the rest of the world has done exactly this. I like using the NRA as an example. You (typically) don't need a license to own a gun, and you don't need to join the NRA, but they have credibility, without being official at anything, and they have some perks too.
Just a thought.
Tim