Weero, as you know, I am not solid on M+, please have a closer look on mileage earnings on Z fares: Maybe it’s only in theory, but award miles in booking class Z should be the same as in every coach class fare.

The good thing is, that you are planning well in advance: Under current conditions your first choice FFP will be M+ (did you have a chance to look at EK/UAs RTW ex Thailand for approx AUD 5.3K in Biz?). IMO you need a second FFP for flights without exec. bonus earning potential in M+. But which one?

I know it’s very difficult to stop maintaining elite status if you bank one million miles in your account. I value this € 10K, which is an awful lot of money for me. You earned it the hard way therefore you should get the most out of it. You can use the miles for yourself or to help others, the latter might be the most efficient way.

If you decide not to maintain SEN you going one step down the ladder to FTL for two more years. Before you do that you should have a look at perks you are losing and how to substitute it. Eg you can gain lounge access through Mastercard Platinum (not in every country) and Priority Pass.

If you like to top up miles, earning in M&M other than flying is not that expensive (eg. Coop & ricardo seems to be a good combination).