> I'm also mildly concerned by how duplicative the code becomes post-patch.

I know, that's why I added that comment on GitHub.

> perhaps just implement _PyTime_ObjectToTime_t as a wrapper for _PyTime_ObjectToDenominator

Sure, but will that increase the chances of PR 11636 being accepted? Unless a core developer who is willing to merge that PR asks me that, I'd rather not add extra complications to that PR. (to be clear: I mean no offense, it's just that getting a CPython PR accepted is hard)