Huge thanks to @enolan, who added the source to GitHub:
Alright, go nuts: GitHub - enolan/beescheduler
If you end up getting it running and hosting it somewhere let me know and I’ll replace beeschaeduler.echonolan.net with a long to your thing.
I would love it if @narthur or someone takes this forward and ensures this functionality remains available to the community.
Challenge accepted!
I’ve got something up and running, though haven’t done any testing yet. Use at your own risk. 
Yup, seems pretty broken currently. I’m off for the weekend but hope to get more of the kinks worked out next week.
As the Beescheduler site notes,
WARNING: For technical reasons, any goals you use Beescheduler for will always appear to end in two weeks. The road will end in two weeks when you first set them up, and every day the end date will advance one day, maintaining the two weeks time.
One downside of this is that you can’t set breaks that end in more than two weeks.