Could QF offer the old guys who are about to retire, to subsidise their instructor training and use them. I'm not a pilot, but quite a few I have spoken to love to fly and maybe would like this as a part time gig.
I don't know how this works with the retirement age, but it is just one thought. QF seems to lack any lateral thinking. They also don't seem to want to have any happy employees, which how happy will a SO or FO be to go back to GA.