What you are asking is impossible as the device will not boot up fully unless a cable is connected to the VM network
I haven't tried with a Hub 3, but I can confirm from my experience that statement is factually incorrect for earlier hubs, and I'd therefore guess that the same applies to the Hub 3. Plenty of posts on this forum describing how to do it.
Take this one - scan down to the reply from Sephiroth, follow those directions. I'd advise that you reset the hub-to-be-access-point before starting, and then to make the changes to it (if possible) use a laptop or chromebook to connect to it via ethernet, rather than using the ethernet from any primary PC. The logic there is that Windows struggles if you keep switching its ethernet connection, which doesn't make it impossible, but in my experience requires you to restart the network adaptor a number of times, and that's inconvenient and time consuming.
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