I'm going to write an importer using zipfile and importlib in pure Python. I'm doing this so that (a) there is an importer that relies on zipfile and thus what features it adds over time, (b) to have good example code to point people to when they need to implement their own importers, and (c) for me to see where there are API holes in importlib and the ABCs in order to continue to try and make things easier for people.

Do realize that the last point means I will most likely be writing this myself no matter what people contribute (sorry). If people still want to tackle it to provide feedback on what importlib is lacking that's totally fine and welcome feedback, but since this is partially an exercise for myself I feel like I do need to type it all out from scratch to discover sticking points, even from an experienced perspective. But I'm happy to discuss design choices, etc. here with folks as this progresses.