Move without losing a thing
Import your league at any Gameweek, just after its deadline. Every squad, table, fixture and locked lineup comes across, with every move and trade, and the draft FPL Draft still shows. Look around the rebuilt league privately before anyone else is invited, then each manager claims their team with a code.
If your league has redrafted, FPL Draft may show only the latest draft, so earlier ones may not come across. You'll see exactly what did before anyone else is invited.