...If you are going to use Oathkeepers name on it then please get their permission.
I support this idea, don't get me wrong. But if you are going to do it, do it with their blessings. They may have something, or have an idea in works. Maybe they have thought of this, and decided against it for reasons we do not yet understand, based on information or analysis not privy to us.
For the record, I never served, but joined Oathkeepers early on as an associate member. They do have slim jims and I have given them out to police before.
http://oathkeepers.org/oath/resources/ has links to fliers and printable cards with the 10 orders we will not obey.