I've been running into many of the same pain points in trying to implement a performant/reliable Kubernetes cluster on my Unraid server without resorting to a VM. I think the move might be to migrate Unraid into a Proxmox VM imo. The other option I believe is opening 2375, but I feel like the security risks carried by this and the tunnel for the otherwise super useful MyServers plugin being open is a little too unsafe for my data. I think the template off of the community apps page currently fails to launch clusters/containers because of various containerd errors that point to the template being autogenerated, unsupported or at the very least not active enough for a stable homelab Kubernetes setup:
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