What is your goal? It sounds like you're trying to add range. In that case, I don't think adding a secondary controller will work for that purpose. If you still wanted to try, with any Z-Wave stick (that the software supports), you could use Z-Wave PC Controller on a PC to add the stick to your Hubitat network. Put Hubitat in regular Z-Wave inclusion mode, then do a "Classic learn mode" (or "Classic inclusion" or whatever it's called) in the PC Controller software with the stick plugged in. Since you have a Z-Stick, you could actually probably skip the PC Controller part entirely since the Z-Stick can be put in inclusion mode with its button instead. I've never tested that method (I like to use the software to be more sure of what I'm doing and what has actually happened), but I don't see a reason why it wouldn't work that way, too. Since it sounds like you only have a Mac, I suppose you could try it and see what happens (but I can tell you you could use VirtualBox and a Windows trial along with the USB "passthrough" feature from VirtualBox to get the Z-Stick into the Windows VM if needed, at least as long as we have Intel Macs).
That being said: if you're just trying to extend the range of your Z-Wave network, I think you'll have an easier time with an actual repeater. You don't need the dedicated "repeater" (repeater-only) devices on the market, though they would work and may be more appealing to you for any reason (e.g., the Ring has battery backup, the Dome has USB options for power, and the Aeon is...I guess one is 700-series and doesn't need a C-7 like the Ring one?). Any mains-powered Z-Wave device should work as a repeater, like a switch/dimmer, smart plug or outlet, or one of the few Z-Wave smart bulbs on the market.
But since you already have the stick, I guess it can't hurt to try.