You can get closer by limiting the depth and breadth of the API, for example by using VT100 and the I/O operations from the C standard library.

That is ‘a bit’ minimalistic, but it is “just a single stable, non-bloated, reliable, portable platform that could be used for when you just want to Write Once and then know that it will Run Everywhere _forever_ […] Would not even have to be an entire API”, and it could run on hardware that has no chance to run Win32.

But it's not cross platform. Unless you count wine.