How to DELETE (only) the dead key? (MacOS)

[SpecialCharacter]

Occasionally, I want to delete a dead key at a specific text location.
Only the dead key shall be deleted; the base character has to stay.

(Kind of the opposite of #648.)

On Windows it works, but MacOS deletes the base character as well on most text-based applications.
I already use Quartz for good text support, but now I am stuck.

I thought of virtually marking and copying the whole combined character in question (to entangle them later), but is it possible in pynput? Virtual ctrl-c/ctrl-v should be possible.

Any ideas?

[SpecialCharacter]

PS: I tried

    # Simulate Cmd+C to copy selected text
    controller.press(keyboard.Key.cmd)
    controller.press('c')
    controller.release('c')
    controller.release(keyboard.Key.cmd)
    time.sleep(0.5)  # Wait for clipboard to update

but nothing was copied.
As I have added Python to my secure applications, so access to the clipboard should not be a problem …