Hi again @agittins and keep up the good work.
Well after much thinking and tinkering here it is…
Introducing BLE Positioning System (BPS) – A Smart Indoor Tracking Solution! 
BPS is an innovative (near) real-time indoor positioning system designed to seamlessly integrate with Home Assistant. By utilizing ESPHome devices with Bluetooth proxy functionality and of course Bermuda, BPS can accurately track your Bluetooth devices within your home.
Key Features:
(near) Real-time tracking – See exactly where a device is located on a floor plan, just like GPS on a map.
Zone detection – Define zones (rooms) and track if a device is in a specific zone.
Multi-floor detection – Determine which floor a device is on for precise presence tracking.
Get started now! Learn more and install BPS from the GitHub page:
GitHub Repository
