We here at Sidero Labs are not capable of time travel.
If we were, we would send you back in time to KubeCon so you could watch Clément Nussbaumer tell his story of migrating 25 clusters in an air-gapped environment.
But if you have a few minutes, you can watch his talk on YouTube. Check it out for a live migration demo and a look at how Post Finance manages its fleet. It's a great watch. https://www.youtube.com/watch?v=uQ_WN1kuDo0