Nice tool :) I did something similar in a hackathon some years ago. https://github.com/Rucadi/wsld

It's totally unmaintained and forgotten :D

In general, what I do now to generate WSL images is to docker run a container, and then export it to a .tar, finally, install that tar, is that easy.

However, if I had your tool installed, for sure I would use that for ease of use.