I don't see this as within the scope of sustainable living.
First, money is always transferred debt with or without interest, whether or not we are on a gold standard, if we accept Graber's theories. Gift economies are explicitly this way. The fisherman gives away fish and thus gains honor, and other people give him things thus gaining honor themselves. It is out of these systems that currency arises, I think out of a need to be able to account for and pay off certain kinds of debts (particularly in a legal framework, at least if early Iceland and Ireland are good examples of formalized commodity exchange systems as currency). Moreover I think you can see double entry accounting rising in a Europe where cash was seen as a debt equivalent rather than the other way around (hence our basic accounting terms, borrowed from Pacioli, are basically the language of debt in Latin).
So in this regard, "what about debt-based money" doesn't really matter regarding sustainable living. Even if money was on a gold standard it would still be a way to transfer debt. The important aspects I think are how we make the connections in our personal lives of mutual obligations. I could see aspects of gift economies playing into such discussions, but all money is debt-based. I owe you, so I give you a token that allows you to pay off what you owe someone else. It doesn't matter what that token is, really. Alternatives to that approach might be relevant.
This being said, I would hope that "What about economic strategies for sustainable living" would be very much on-topic, and might include some degree of personal finance (with a sustainability aspect), cultivation of elements of gift economies etc.