I appreciate the feedback. I’m under the impression that do complete an instructor course you must first complete DM, no?
If that’s true, do you mean find a program that lets you complete everything all in one go?
You make a good point with your question....PADI and SSI require divemaster certification or equivalent from another agency as a prerequisite for their instructor training certification programs, but a review of NAUI's instructor prereq's indicates one must be either an assistant instructor or divemaster....divemaster is not a prereq for NAUI assistant instructor.
But further to the point of your question...yes, if you believe you truly want to be an SCUBA instructor then enroll in an all-in-one program that caters to attaining that goal. It should prove more economical financially and/or from a time-investment perspective.
-Z