The interest is there but nobody is designing or implementing it. Realistically, make a module sporting the proposed API and put it up on pypi and after success there: raise the issue on python-ideas.

Read the entire thread here first before designing such a thing.

We will always have unsolvable problems in any crypto shipped with Python such as side channel attacks. Those are outside the scope of what the CPython project should ever attempt to solve. Document them as weaknesses and suggest people use C libraries dedicated to avoiding those problems if their security needs require it.