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Did you try anything like this

[...]
$ cat >~/.k3d/registries.yaml <<EOF
mirrors:
  "registry.localhost:5000":
    endpoint:
      - "<http://registry.localhost:5000|http://registry.localhost:5000>"
[...]
$ k3d cluster create ... -v ~/.k3d/registries.yaml:/etc/rancher/k3s/registries.yaml

• I use above for connecting to a docker registry container however above can be expanded to use private registry with creds and tls etc • And I didn't grok enough to find other ways as above worked for me 😅