Home Assistant is the great smart home translator. They talk to pretty much anything, but automation on there is not as easy as with Hubitat in my opinion. There's a fantastic community integration here that brings devices from Home Assistant into Hubitat. There's also an integration that goes the opposite direction if you ever needed that for any reason.
What you could do is setup HA just for one of the two Z-Wave frequencies (logically the one with fewer devices), and then use the integration to bring those devices into Hubitat to automate.
