How about when you retire you take your pension as normal.
If you became a reservist QFI full time, then they pay you at least what you were earning whilst in the service and you get your pension.
If you work for the airlines and long haul for example, then you could work 1 day a week reservist and be paid pro-rata.
If 5 guys did this then they have the equivalent of 1 FTRS pilot.
There would be a huge take-up and the FTRS manning/QFI crisis would be solved.
If anyone leaving who was a not a QFIs and wished to do it, then just prior to their exit point they could do an abbreviated QFI course, providing they agreed to be 5 years reservist on a 1 day a week contract or 2 years on a full time reservist contract.