All I would say is from my perspective is when I'm looking for skippers now to drive my charter boats, I much prefer to use someone who can prove they have got a decent amount of practical experience, rather than someone who's got all the tickets but did them over a couple of weeks at UKSA or similar! I've seen seemingly well qualified people making the most basic of errors. eg putting 2 stroke oil in 4 stroke outboards, not being able to tell why an outboard won't start (helps if you put fuel in the tank) etc. It might be worth your while getting some basic commercial tickets (eg pbi), doing some work for a sea school or similar, and building up to a more advanced level over a few years. That way you'll have a much more comprehensive and attractive CV for future employers.
That's not to say Doug's fast track courses arnt any good. If you have the necessary experience that may well be for you. I did several of my "tickets" at Stormforce and rate them highly.
All IMHO as a charter operator.