I am not familiar with the Tuya integration you created, but I think I get where you are going. I wouldn't want to see you go through the trouble of adding tight integration to ecobee if I'm the only one using it.
I'm using the IFTTT integration to ecobee to do most of what I want to do. I think more users would benefit if you implemented any planned IFTTT enhancements instead. For this specific issue, if you add the ability to pass headers to web calls, I think that sort of change could benefit users more broadly.
Lastly, if you're "in under the hood" and you have any ability to capture any debugging info on web calls (without filling up your database with large logs) that will be helpful. Maybe a way to fire off a sequence interactively from the sequence list, that would display (not save) the results to the screen. As if I launched the web call from CURL from a command line. Just a thought for the bottom of your list somewhere.