Hi All,
I found that my local transit group was releasing GTFS feeds more often that I expected and each time I needed to go in and run @renemarc 's excellent steps to clean up the feed and make it efficient for HA to use.
Because I was doing this every few months, of course I needed to refresh myself on the steps that needed to be done, and I ended up spending time that could have been spent better on other things.
So I have created an Appdaemon app, which I hope others may find useful as well, you can add the repository into HACS, and then add the block into your apps.yaml file and create the input_boolean to allow you to trigger it when you need. All the information is in the repository:
thanks simonhq!