Great idea! I love how this makes testing easier and avoids clutter and extra costs. The cost breakdown was super helpful too. Are you planning to add notifications before accounts expire? That would be really useful!
I currently have no plan to extend this project as it is. It was more meant to be a way of learning new things, and a starting point for people who want to build something similar.
Every company/user will have their own needs, and it would be hard to have a solution that fits every use case. Feel free to copy or fork this project and extend it to your own needs, though.