Tbh, it's not that "hard" nor is it hard to make it more convenient. I've actually built a small tool that has the UX of regular SSH but under the hood reboots

Tbh, it's not that "hard" nor is it hard to make it more convenient. I've actually built a small tool that has the UX of regular SSH but under the hood reboots into rescue, configures the keys and opens an SSH session. Once you close it, it reboots back into regular mode. I've wrapped that tool again to then build a tool that takes just an ignition config and automatically images a hetzner server with fedora coreos using that config. You could easily build your own tool that reboots into rescue, installs a VM, mounts all the necessary devices, boots the OS image, and exposes the serial console of that VM to you. It took me a while to learn to love Hetzner's solution, but I prefer it over having to use shitty proprietary KVMs.