One option that might be considered is becoming involved with the Atlantique 3 program.
Several threads have referred to the increased desire (from some) for a European Corps or an increased co operation between our friends across the Channel.
The French have shown an interest in the MRTT platform and the UK needs to offset costs as much as possible. Maybe a bit of negotiation on the use of (some of) these assets by the French may be a step towards the UK
becoming involved in the 'Euro LRMPA'
Potentially a lease to buy agreement using the MRTT as a financial chip could be negotiated to give the UK (as part of the overall package) a few ATL 2 as an interim measure to ensure a token LRMP capability is maintained before converting to an ATL 3 option.