If you can find the time to get up to speed on Kubernetes, I would say do it.
I actually have a weirdly similar setup to you (I run on Hetzner and used and still use ansible), and I've written about it, most recently when I switched my single node cluster to Ubuntu 18.04 [0]. In the past I've also run a single node kubernetes clusters on CoreOS Container Linux, Arch, and back to CoreOS Container Linux in that order, from versions 1.7~1.11.
I actually have a weirdly similar setup to you (I run on Hetzner and used and still use ansible), and I've written about it, most recently when I switched my single node cluster to Ubuntu 18.04 [0]. In the past I've also run a single node kubernetes clusters on CoreOS Container Linux, Arch, and back to CoreOS Container Linux in that order, from versions 1.7~1.11.
[0]: https://vadosware.io/post/hetzner-fresh-ubuntu-install-to-si...