So would the best solution to promote this, or are there downsides or issues it cannot solve? devpi’s index inheritance is (from my understanding) the exact solution for this, and it is also not at all difficult to develop more limited (but still working) alternatives if you don’t need much of the other stuff devpi offers. It would be much easier if we can push this approach to cover the use case, and may even be able to reduce complexity and source of confusion in other areas, e.g. remove the need of --extra-index-url entirely (!)