Run-time-patch python module

Question

I am searching for a way to run a module while replacing imports. This would be the missing magic to implement run_patched in the following pseudocode.

from argparse import ArgumentParser

class ArgumentCounter(ArgumentParser):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        arg_counter = 0
    def add_argument(self, *args, **kwargs):
        super().add_argument(*args, **kwargs)
        arg_counter += 1
    def parse_args(self, *args, **kwargs):
        super().parse_args(*args, **kwargs)
        print(arg_counter)

run_patched('test.test_argparse', ArgumentParser = ArgumentCounter)

I know that single methods could be replaced by assignment, for example stating ArgumentParser.parse_args = print, so I was tempted to mess with globals like sys.modules and then execute the module by runpy.run_module.

Unfortunately, the whole strategy should be able to work in a multithreaded scenario. So the change should only affect the module executed while other parts of the program can continue to use the unpatched module(s) as if they were never touched.