It would be very beneficial to see the alternative receiver-type modification on Voyager. It "future proofs" the fleet and gives it utility with quite a lot of other countries that we might expect to assist. The problem is, in this climate, we can't afford to future proof anything really - it has to be needed now or very soon, with a robust BC to support it, or it gets no funding.
If we were to decide to buy a boom-type aircraft, I'm sure the mod would happen as a consequence. Who knows.