Migration from Rancher on k8s to Rancher on k3s

I was wondering if anyone has suggestions as to how a Rancher on k8s installation could be migrated to a Rancher on k3s installation.
The existing clusters have about 10 nodes each.

I thought about just doing half a migration, by importing these clusters into a fresh Rancher on k3s instance, while letting them stay in the previous Rancher on k8s instance. However, I do not know if this is feasible, since the cluster should theoretically then be modifiable by 2 Ranchers.

I would appreciate any hints on this topic.