I've been using a Silicon Labs z-wave usb stick and Silicon Labs PC Controller for updates. You don't need to unpair the switches. Just set up the stick as a secondary controller. It works pretty fast and you don't have to fuss with any Hubitat driver changes or pairing/unpairing.
Just follow the instructions in Tip: Removing invisible nodes and updating device firmware to make the stick a secondary controller, then update the firmware through the PC Controller software.
