They feel a bit more orthogonal to me, given that unikernels are about sharing a VM hypervisor, whereas containers are about safely sharing a Linux kernel.

They're solving similar problems in terms of reducing image size, startup time, security surface area, and so on. But the mechanism is quite different, so it feels like basically none of the tooling will translate. Like, where is the Kubernetes of unikernel deployments? It would have to be built from scratch, and would probably end up looking more like Terraform than like the Kubernetes of today.