You might want to look over the ANDI CCR program. Specifically, course TRD Level 3 - Technical Rebreather Diver Level 3. Link attached to the course standards.
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I just finished the course with Bruce Konefe in Thailand and its rated to 50MSW/164FSW and 30 Minutes of Deco only Air Diluent. I will be doing a detailed write up on the blow by blow for each dive on this course as well as a few others I took once I get a few spare hours. ANDI's program is indepth and ensures you are task loaded with valuable exercises in controlled conditions. It really starts to get you comfortable with many critical skills like SCR for extended periods.
Not sure if this fits the bill for what your are looking for but I thought I would mention it.
John