How do I "clone" my TL save data?

[LNLenost]

Heya, I own a Switch 2 and wanted to have 2 different Tomodachi Life island (possibly on the same account) and have a convenient way to switch between them. My first thought was to disable automatic cloud saving, playing the game normally and whenever I want to switch I download the cloud save, but that would overwrite the local save with no way of recovering. My second thought was to keep one of the islands on the Switch 2 and the other one on my modded Switch 1. So I turn on the Switch 1 to try and download the cloud save to find out I have been BANNED.

I don't have any other ideas... please help!!