Have any of you done a crossover at the DM level to another agency? Or hold DM certs from two or more? If so what was involved both cost and education wise? Reason I'm asking is that even though I'm PADI I'm taking NAUI tech courses and considering a NAUI technical support course which would count towards a tech DM rating. This would result in me being at some point a PADI DM and NAUI DM able to DM on tech dives. PADI does not have a tech DM rating and I don't think DSAT is even geared towards tech DM duties.