If you're using wsl2, /dev/kvm should be available. You may need to install a couple extra packages to enable kvm etc.

Curious what prevented you from running docker in a microvm? I've successfully run docker in qemu and firecracker microvms.

I've been experimenting with krunvm and there the init system is weird. Didn't evaluate firecracker since it doesn't support macOS hosts.

So we originally just wanted the vm to be light-weight and can start fast, so we removed docker. @binsquare has a change later to add docker back.