Guys, I think you are overthinking it. The database will be copied next week so that you have all your stuff: airplanes, squadrons, everything... on Dogfight Elite.
If someone hasn't logged in for MONTHS. Again, MONTHS. I assume that that person is not playing and the account in Dogfight Elite and ONLY in Dogfight Elite will be removed.
There may be one or two people who has a reasonable explanation to own an ACTIVE squadron and not show up for months. Those I could count with one hand and all they have to do is write to me to work it out. Most people who hasn't played for months and own a squadron, they have abandoned the squadron and it is not active.
So, there is no mess. There is plenty of time to move into Dogfight Elite and your info will be there waiting for you. In the particular case that an issue arise, which I expect it to be very very few, I can handle those manually.
If I'm wrong and there are more than a handful of cases, I can write a system to migrate accounts once the dust settles. Honestly, I see no big deal.