Reconnecting devices after using Homeseer

I used to run a C7 hub. I decided to try Homeseer a couple of years ago after having some Z-wave connection issues. I have now decided to come back to Hubitat. I still have the C7, which I have reloaded an old backup. All my rules are there, but obviously, there are no devices as they are currently on Homeseer.

What is the best way to return the devices using the old rules? I am also getting the C8 Pro. Should I reconnect on the C7 first?

In the end I decided to recreate the hub from scratch. A fun few days moving things across and creating new rules.