I believe ELCs are still restricted to Level 3 courses? e.g. Foundation Degree or similar level. Hence most are either knowledge heavy (IT systems) or have lots of theory as well as practical elements (e.g sparks, gas etc).
Someone once told me every Level 3 course has to have some maths in it to qualify! No idea if that is true or not. BOSIET is more of a safety indoctrination so I doubt would meet the grade unless combined with some sort of offshore engineering course? Happy to be proved wrong mind! Some companies in Aberdeen are now advertising 'offshore apprenticeships' to ex-forces where you get intro to all engineering disciplines - you pay for the course (18 weeks long I think?) but they reckon they can place you in work at the end (not guaranteed...).