SamurottX

A magazine on kbin is roughly equivalent to a community on lemmy.world, so I’m 90% sure that’s not possible. You as a user subscribe to a magazine/community, regardless of which instance it is on. You’re essentially asking how to automatically re-post from one community to another, right? That can turn into stealing other’s content really quickly so not sure if that’s the best solution.

A possible solution to your situation would be creating multi-communities a la Reddit where you can view multiple communities at the same time. So while it wouldn’t be in your community, it’d still be visible for you to interact with and the actual location doesn’t matter.

The easiest solution might be to just add an option to export your list of subscriptions as a comma separated list, or some other plain text format. It’s not completely seamless but moving to a different instance involves making a new account so there’s no real way around some kind of export/transfer process.