This doesn’t sound too far away from the Weather Calculation binding. Generating derived weather calculations with the Weather Calculations Binding. It’s not a merged binding so I don’t know how acceptable the overall approach is to the maintainers, but at least there is precedence.
How would you envision this working from the user’s perspective? Actions in Rules? Channels? Profiles? A combination of these?
The challenge from a usability perspective I think is how do you give the data to the add-on in the first place and then get the answer back given that the data may come from Items linked to all sorts of different bindings. I don’t have any experience with the Weather Calculations add-on so have no opinion on how they chose to do it (I don’t really even know right now).