Can you be Buddhist and teach another religon?
You don’t have to love math to teach it, and you don’t have to be an upstanding moral person to teach ethics. You can teach Baha’i if you want to, there’s nothing wrong with it unless you feel like you’re misleading the children and you feel conflicted inside. I think though that if you learn about Baha’i, you won’t have a problem with it as a Buddhist.