I figured out a way to this from within the Hubitat user interface.
If you open a Z-Wave device in the admin portal there is an un-conspicuous looking button named Advanced. If you click on that you will see a prompt from where you can send arbitrary Z-Wave commands to the device.
If you enter 85 01 03 01 and click the send button (make sure the sensor is awake) it will add the hub (Node 1) to association group 3. This should in turn cause the sensor to send sensor reports and, if available, temperature reports via Z-Wave. ( I still have not looked into getting Hubitat to ingest the temperature reports, but I suspect you can verify it by changing the sensors device type in the Hubitat UI to a temperature sensor temporarily)
Here is what the numbers mean in case you want to do associations in other groups and to other devices ( I tested this by associating one of my switches to another switch )
B1: Command class (Association = 0x85)
B2: Command (SET = 0x01, you can use REMOVE=0x04 if you need to change something)
B3: Association Group number
B4: Destination Node ID (Hub should be 1 unless you have it set up as a secondary controller in the Z-Wave NW which is highly unlikely)
Hope this is useful.
