Let us look into reality. Those who have a lot of frequent flyer miles either cannot plan their personal trips for exact dates or trying to combine business with pleasure or just do not want to fly anymore. Sometime those hundred thousand miles are just dying as it happened with my Lufthansa miles or at best you can use them for children. Probably the better solution is to sell them and not link your trips to specific dates and regulations for their use.
There is a solution https://www.mylefly.com/sell-your-miles
Isn’t it better to not to have any rights, coupons, long term benefit and just to have cash? Cash- TODAY