While not "Band Steering" you can actually use the MAC Filter Setting under the Gateway > Connection > WiFi to set the Mac Filtering Mode to Deny for the 5Ghz SSID and add your device into the WiFi Control List.
You would see your device get disconnected from the network but if you tell it to re-connect it will re-join onto the 2.4Ghz SSID, useful if you need to force your phone to setup a device that only uses the 2.4Ghz band.
This sounds like a good idea as I am having trouble viewing my SkyBell and the guide for it says only connect to 2.4ghz. However I can’t find the MAC setting area. Is this in the Shaw bluecurve app? Where? Or do I have to look elsewhere?