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You could make a mesh with something like Netmaker to achieve similar using FOSS. Note I haven’t used Netmaker in years but I was able to achieve this in some of their earlier releases. I found it to be a bit buggy and unstable at the time due to it being such young software but it may have matured enough now that it could work in an enterprise grade setup.

The sibling comments recommendation, Nebula, does something similar with a slightly different approach.

> They run a Wireguard network between the nodes so you can have a mix of on-premise and cloud within one cluster.

Interesting.

A quick search shows that some people already toyed with the idea of rolling out something similar.

https://github.com/ivanmorenoj/k8s-wireguard

I believe the Cilium CNI has this functionality built in. Other CNIs may do also.

Slack’s Nebula does something similar, and it is open source.