Thanks for your reply 😉 I choose wich prims I want to return with https://wiki.secondlife.com/wiki/LlReturnObjectsByID no need to id the object name or group or description with llGetObjectDetails to determine if they fit into this or that holiday setting. (wich wouldn't be hard either) Simply copy&pasta the method's data, you choose into a list and that is it. It's not hard to make a small script to follow that rule.
I don't agree with you abut the memory, especially now with LinkSetData everyone gets a decent amount of memory to store uuids in, so I doubt that external memory is needed for that. Com could be done via chat channel, so you would't even need a persistant UUID. So everyone can take care of their own stuff with a small LSL script. And if somebody still doesn't care or is uninformed, you still have the option to AR. That's my opinion.
However there should be a clear reminder for everyone, could by done by script also! 👨💻