It's no more of a pyramid scheme than any other agency runs, all the tech ones included. You can do stand alone elements of Dive Leader using Skill Development Courses (SDC) and regions often have Dive Leader training days mostly for those in BSAC filling in gaps, but TBH their is no substitute for doing the course proper in a club environment. This way all the elements are done for real, on real dives using other club members as willing participants For theory Dive Leader is mostly made up three sections which can be done as a complete course or split into SDC's, For you you might prefer to do it as an SDC, so : O2 Admin - Includes First Aid etc. with medical issues related to gas use Practical Rescue Management - Theory and practical of managing fubars, depends who runs it, but these can be good and often very realistic. Includes Helicopter operations, risk assessment etc. Dive Planning & Management - Two day effort that involves a few dives and includes a lot of hands on experience. Also strays into elements of PRM. After this it's a range of skills on dives many of which you'd have already as part of other certs, so a breeze, but other elements including some variables in rescue that you may not. This last bit you may struggle a bit to do unless you are a member of a club.