An entity database (rest api on postgres so dB is a stretch) with a crud frontend for platform engineering. Adding a similar control loop to kubernetes and bash script (or executables) as the extension language.

This way you can write all of your glue code into one platform and create an IDP at the same time.

This came from a lot of situations where I'd need like one random thing to be stored in a database, but adding that complexity is a bit of a hump for just one thing.

Also crossplane is a really cool idea but starting a kubernetes cluster so that you can manage infra sounds insane to me, even as an avid kubernetes fanboy.