Awesome idea. The missing option to select a backup account is the reason, why we don’t use Auto-Select together with my wife. We use one account and I sometimes manually move over some money from the other „pockets“ like presents, shopping, leisure, …
But maybe, it is a good thing also. Because when there is no money left, there is no money left… sometimes it is hard to getting used to this „there is no money left“ thing, but on the other hand, this is one of the best things about bunq. You need to decide actively, and cannot go into debt.