Because association changed with Z wave plus, I don't think we are going to see anymore secondary controllers like the minimote which can form associations between two other devices.
With SmartThings, the preferred method now is to use the Z wave tweaker DTH. You just assign the device temporarily to that DTH, create your associations, then shift back to your every day driver.
I don't know if it's possible to port that to hubitat, but it would be the easiest way to deal with associations.
Failing that, you need to look into adding some secondary Z wave controller to hubitat, and I don't know if that's supported either. But the tweaker would be a much better option because it doesn't require buying a second device and it's much easier to use.
