Sure, this is a viable approach. But again, are there any examples of companies actually doing this at scale?

I'm not familiar with MicroPython, but checking out their website, I expected a testimonial section heralding how it's used by * insert IoT company here *. I'm still not convinced that Python is being used for anything other than hobby work and prototyping on MCU-based designs, but maybe I'm just not looking hard enough.