Hi Wigster, and welcome,
The ‘multiprotocol’ usage of the zigbee chip by Thread, is not recommended. Of course it could work OK with not too many devices, but what is “too many”.
To me you are going towards the ‘pushing it’ point with ~100 Threadbee devices, but you’d have to test it (if you’re into that).
Otherwise, when you don’t have any plans to ditch the apples, I should stick with the apple Thread border router.
