Yes. Can you use PyObject_Call instead (or one of the non-Vectorcall variants listed in https://docs.python.org/3.9/c-api/call.html#object-calling-api )

Vectorcall is mainly a speed optimization over PyObject_Call. We want to allow the C compiler to inline PyObject_Vectorcall whenever it is used.
That can be done with static functions or macros, which does unfortunately mean that the symbol is not exported.