Any Fitbit Inspire 3 user that also use Bermuda? How to find the IRK?

Hardware
1

My Inspire 3 was working reliably with Bermuda, based on the Fitbit’s MAC address - so I could track nicely where I and my wife were around the house.
Although the device would only work with the Bluetooth proxies while it was NOT connected to the phone, that was fine; I just turned Bluetooth off on the phone. The Fitbit would more reliably tell me where either of us was than the phones anyway.

Then came the upgrade from the Pixel 4a to the 9a and initially the Fitbit wouldn’t sync with the phone any more. So I bit the bullet and installed the new Fitbit firmware which seems to have one major security improvement that I wasn’t aware of:
Randomization of the Fitbit’s MAC address :hushed:

The Fitbit syncs with the phone again but now, I guess I need to somehow find the IRK for the Inspire 3 in order to add it to the ‘Private BLE Device’ integration.
Anybody got any experience with getting IRKs for non-phone devices?
Would this method ( Getting the IRK for your phone - Community Guides - Home Assistant Community) work for the Fitbit as well?

2

For that method to work you have to be able to pair your device with the Ardunio IDE temporarily so that the Ardunio can read the IRK - in other words, the device has to initiate the pairing. Don’t know if you can do this with Fitbit.

3

Tried to pair the Fitbit with my PC but that didn’t work - seems like it ‘expects’ the Fitbit app to respond.

Probably not going to work then.