Gotchas: connecting an extra standalone compute host to the central standalone host is problematic as it doesn't fit the supported multi-cell v2 topologies in OSP. No dev envs shortcuts possible? If that would become supported at least for dev envs, the approximate scenario might look like:

• Create the edpm-compute-1 and edpm-compute-2 virtual machinee for Nova compute cells.

make edpm_compute EDPM_COMPUTE_SUFFIX=1
make edpm_compute_repos EDPM_COMPUTE_SUFFIX=1

• Omit the edpm_deploy make target to not making it managed from the control
  plane running on OCP. Instead, deploy it as a 2nd TripleO standalone Heat stack,
  with an extra OSP compute:

make standalone EDPM_COMPUTE_SUFFIX=1 EDPM_COMPUTE_CEPH_ENABLED=false
(requires intall_yaml to support exporting stack data to use it with consequent stacks additions 
https://github.com/openstack-k8s-operators/install_yamls/pull/568)

• Ssh into deployed standalone host:

ssh -i ~/install_yamls/out/edpm/ansibleee-ssh-key-id_rsa [email protected]

• Discover the deployed compute host keys (a passwordless access is required by
  the Nova Live-migration feature):

ssh-copy-id -i ~/.ssh/id_rsa [email protected]

• Discover the remote compute node from the central controller node ...