I do something kind of like this, but all of my scripts break when the underlying env is suddenly broken when e.g. brew updates python without asking me and breaks all existing environments.
I'm sure I could come up with solutions that are very robust for my particular machine, but I would like something that allows me to share it as a gist and a teammate could just as easily use it, or I can use it myself on another machine without hassle. In other words, a solution contained within the script iteself and maybe one or two binaries outside that make it possible.
I see, it might be heavy handed but running them inside Docker containers might provide you with the isolation you're looking for. You could also build and share these images with your teammates.
I've actually started using a lot of different CLI tools with Docker, especially when the tool isn't available for my OS.
I'm sure I could come up with solutions that are very robust for my particular machine, but I would like something that allows me to share it as a gist and a teammate could just as easily use it, or I can use it myself on another machine without hassle. In other words, a solution contained within the script iteself and maybe one or two binaries outside that make it possible.