No, I disconnected the HUSBZB-1. I know Hubitat will prioritize an external Z-Wave radio over an internal one (not that it matters here since the C4 doesn't have one), but I have no idea what would happen if you connected two external ones, and don't think I'd have a good way to tell which one it's using.
This requires changes on Hubitat's side beyond just what the Z-Wave hardware supports, so a Zooz S2 stick alone won't get you there. They are apparently working on it or at least planning to but have no timeline:
