This is basically exactly what we needed at the start up I worked at, with the added need of being able to host open source projects (airbyte, metabase) with a reasonable level of confidence.

We ended up migrating from Heroku to Kubernetes. I tried to take some of the learnings to build https://github.com/czhu12/canine

It basically wraps Kubernetes and tries to hide as much complexity from Kubernetes as possible, and only expose the good parts that will be enough for 95% of web application work loads.