I am using the Workday integration in a couple of places, primarily to drive scheduler cards. It is very helpful, but I need to frequently add holidays for things like school vacations.
It would be helpful to be able to add a condition input to the configuration that could be mapped to another state so that we could have more flexibility in automating additional holidays. I am thinking this holiday condition evaluating to true would force the workday sensor to false.
You can do this with a template sensor. Here is my “work today” sensor that integrates a workday sensor, a handful of calendar entities, and a couple of other sensors. This is likely over complicated for what you need, it’s just an example to show you what you can do.
I like your approach but I don’t think it would work for my specific scenario. The issue I am running into is that I’m using a scheduler card (GitHub - nielsfaber/scheduler-card: HA Lovelace card for control of scheduler entities) to manage HVAC. That component directly references the workday sensor as a scheduling option. This works well most of the time, but requires me to manipulate the workday sensor directly to modify the schedule.