Sounds to me like you're just describing corporate certificates. Sometimes if you show up to a related job (eg. Cisco Admin with a Cisco cert) you might get to waive the tech interview. You'll have a really hard time getting employers to accept your authority if they've never heard of you though; I doubt anyone would preapprove an employee that has a card from a company nobody knows.

Your best shot (imo) is to find a way to officially certify developers for a demanded tool. Otherwise I don't ever see this idea taking off.