There are a couple of US-based distributors:
They look like cool little products. It's a little bit unfortunate that they each have a separate API, but the documentation is good and none of them are very complicated.
They also look a lot like Shelly devices, many of which are already supported by built-in Hubitat drivers. Have you looked at any of those to see if they might meet your needs?
EDIT: just noticed that @djgutheinz has shared some bleBox code. Check it out: bleBox Device Integration. And note that it appears to be supported by Hubitat Package Manager.
