Very cool. This isn't a problem I have myself at the moment, but obviously there have been times where this was an issue for people and often when it is an issue, it's a very important issue.

One thing I'd be interested in is how much of this could be done through the browser only.

Chrome for Developers

Communicating with Bluetooth devices over JavaScript | Capabilities | Chrome for Developers

The Web Bluetooth API allows websites to communicate with Bluetooth devices.

Web Bluetooth API - Web APIs | MDN

The Web Bluetooth API provides the ability to connect and interact with Bluetooth Low Energy peripherals.