Typing Ctrl-C in Powershell interrupts the input() with KeyboardInterrupt, so why doesn't GenerateConsoleCtrlEvent?

example.py

import threading
import time
from _thread import interrupt_main
import signal
import os
import ctypes

def interrupter():
    time.sleep(1)  # make sure input() is waiting
    print("Interrupting!")
    import os, win32api
    ctypes.CDLL("Kernel32").GenerateConsoleCtrlEvent(0, 0)
    print("Should be interrupted?!")
    time.sleep(3)
    print("Where's my KeyboardInterrupt?")

def main():
    t = threading.Thread(target=interrupter, daemon=True).start()
    input("Waiting for input:")

main()

I am trying to have a thread cause a KeyboardInterrupt that interrupts the input(), in order to fix a bug in Jupyter where pdb is uninterruptible on Windows. Windows documentation suggests GenerateConsoleCtrlEvent.

But the above program when run only does KeyboardInterrupt after I press enter, i.e after input() finishes.

Yet if I type Ctrl-C on the keyboard, input() does get interrupted. How do I emulate that?

Python 3.8.2 on Windows 10 Pro.