Actually, what could be really helpful other than certification is some form of industry association that survival schools could be a part of (even if an informal one). I've seen interesting courses offered by various companies and it would be nice if there was some way to know if the school is well thought of in the industry.

That said, even this requires a certain level of marketing and education to the potential client base but it may be a bit more easy to do than coming up with a certification to offer to the clients.
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Victory awaits him who has everything in order — luck, people call it. Defeat is certain for him who has neglected to take the necessary precautions in time; this is called bad luck. Roald Amundsen