They sound kind of shape keyish in which case just be careful and be aware you may need in between shapes/blends/whatevers :)
In game cryptocurrencies would be pretty cool but I'm not sure how that would work in a survival island situation. Interesting problem for future you :D
Literal airdrops, from spotter planes ;)
That could work XD
Though then one has to wonder why the spotter planes drop supplies but don't send help XP
edit: unless it's a much harsher version of Survivor that everyone is playing XD
..much food for thought
The ocean also washes up many treasures