You don't need an MCC certificate - why do you think you do? An operator will not view a generic MCC course certificate with any enthusiam, all the more so if done in a fixed wing STD. It won't be worth the paper it's written on, let alone 2000 pounds!
If you get a job flying 365s offshore you'll get the multi-crew time that will exempt you from requiring the MCC when you come to do an MPH type rating. In any case, if you do the MPH type rating with your employer, it will almost certainly contain the MCC elements within it.