So, I finally got around to it. You can find the source code of Todour on GitHub https://github.com/SverrirValgeirsson/Todour
There is plenty of room for improvements as most of the code has grown organically from a minor experiment that I was doing some years ago and I don’t really code that much nowadays. Anyway, I put it under GPL for simple sharing in any form. Hope it’s of value to someone.