Ok, in general is this at least a decent idea? I’ve got a single node docker Rancher Server, I realize it’s not very scalable or HA. So, can I use the single node Rancher Server to create a small K3s or RKE2 cluster and then launch a second Rancher server on that new K3s/RKE2 cluster?

I would instead create a second, standalone cluster and use the Rancher Backup operator to migrate your Rancher instance (if you want to keep your settings etc)

I think that’s a great plan.