Yeah I really empathize with you and Paolo! You two are an artist couple just as Rob and I and neither one has a regular income or even an adequate income!
Both of us have done teaching and all kinds of supplementary kinds of work over the years including making "products" that are more sale-able. But often those "products" wouldn't make enough money, it's very very tricky!
This paradigm I write about is one that I would love to have but haven't ever had the luxury to experience. I hope that one day it will be possible for all of us!