On other wifi APs you can give different SSIDs to the 2.4GHz and 5GHz radios (and, on a ubiquity or other business-class AP, you can also add another SSID that

On other wifi APs you can give different SSIDs to the 2.4GHz and 5GHz radios (and, on a ubiquity or other business-class AP, you can also add another SSID that spans both radios). Then you can have the client connect to the SSID which is available only on 5GHz (even as another client uses the SSID which is available on either).