On a functional level, this is possible to run UN outside of the Kubernetes deployment and rely on federation. However there are configurations where this kind of setup can result in degraded performance compared to what you would see if running on a traditional non-federated system, so it still isn't an approach we recommend broadly, and it may not address the performance concern raised later by the poster. Please talk with your Esri representative if you want to pursue an evaluation of this setup and thanks for engaging with Technical Support if you are having specific issues with your environment. Thanks-
