Very cool. Multi-cloud should be super easy so that we can choose where to put workloads. Have you considered polling the cloud provider APIs to make hosting decisions based on spot pricing etc??
We currently deploy our clusters with a slew of scale-to-zero nodegroups including spot instances that can be selected easily using typical k8s constructs to somewhat accomplish this. We'll look into making this more usable as well, since configuring affinities is not the ideal user experience in a lot of cases.