Brain
With a buoyant market for pilots right now, why not either opt for a civvy crew and/or sign-up willing volunteers to the RAuxAF? With the exception of some added tactical stuff, they shouldn't need to do much more than fly a familiar type between A, B and C, should they?
Ditto servicing - apart from fitting DAS, what else do we need for purely pax trips around the world? A temporary solution to a temporary(...ish) problem doesn't necessarily have be 'we always do it that way', does it?