Just noticed this again, and realise that I thought you had written a plugin, rather than a python script and cron job. Presumably that’s why you didn’t add it to 'Volumio Plugins Collection’.
What prompted me to revisit your post was that someone was recently asking about searching for their latest added albums (which you can’t do with a simple search). You should be able to encapulate your python script within the standard (node.js) plugin framework failrly easily I would have thought … for example, have a look at this GitHub repo, and the post on Volumio.
More information on writing plugins can be found here.