Just a suggestion that if a donor ( like myself ) feels the need to restart their island, it would be nice if they could fill their inventory with things and have them when they appear on their new island. The other option is to have their donor kit in their inventory when they restart, plus whatever extra they received for being a donor, such as a spawner. A small cache of items would make us happy when we restart our islands.
No support. For one, you can use an enderchest to store a small cache of items. Or, you can tpa to a friend (there's a donor perk) and ask them to store your items, then replace your island, then get your items back. The donor kit thing, you can just do your kit command as soon as you spawn on the new island.
No Support, Enderchests are there for that purpose. It wouldn't be a helpful as it sounds. Good Luck!