While we wait for the possible solution others have mentioned, being a platform solution allowing for easier switching devices from hub to hub....
One thing that you could focus on, and use a second hub for, would be to analyse and understand any pinch-points in your setup. By syncing your devices via Hub Mesh to a second hub, you can offload the overhead to then run various apps on the second hub to understand health of your devices, including activity levels and battery status.
You may also be interested in the Hub Information driver, a commonly use tool amongst regulars here, to keep tabs on various metrics that can indicate load on the hub, which can impact the performance or even the availability of the radios on the HE hub.
