Both individuals have plenty of cash, they just 'love' flying
I actually find it quite sad in a sense that there are individuals who end up at retirement age having developed no interests, no plans, and no desires outside of airline flying. There are numerous ways to actively enjoy aviation activities in a post-retirement world, especially if you have "plenty of cash".
I think if they state that they really don't need the money and love airline flying so much, it should mean a mandatory re-assignment to B767 F/O. That will comply fully with their situation.