They're just a pair of converted ex-TNT freighters, rather than BAe146Ms.
The hangar at MPA is too narrow for the A330. Even if it wasn't surrounded by other buildings, attempting to widen it whilst maintaining structural integrity and casting new foundations would be an 'interesting challenge'. A pair of stop-gap C-130J tankers would probably be cheaper until the A400M enters service - assuming that the ATrS contractual clause can be 'reviewed'.