If you already hold CPL(A) with MEP Class Rating, then you should be able to include an IR(A) in your licence under the same terms which apply to any other civil pilot licence holder.
True, but as far as I see it, that requires a modular course with a significant number of flying hours and expense. The other alternative is to use the Military exemptions to get a SEP IR and then convert it, but that also requires lots of hours, 2 IRTs and lots of money.
The contact details for 22Gp are on the first page of the Part O exemptions under the 'Applicability' heading.