Hello everyone, author here. Glad to answer any questions about this pet project of mine. It may not be some fancy new special thing but it works for me, and I hope for others as well.
Looks cool! Including the script in the project directory is the way, and I created on makesh[1] with that in mind. Since it's a submodule it can be easily pulled around with a repo and updated.
Glad to see people are finally going back to ahell scripts since they are very ergonomic and with a little portability in mind, they can be cross platform too.