In a number of carriers, it's not F/O or CAPT. that states 500 continue or G/A. It's the NFP that makes the observation as to whether or not the aircraft if on a stable approach. FR comes to mind with this "Challenge/Response" which seems to work.
Rananim... There is more than airline on the planet that may use different procedures than yours.
Perhaps Rananim, if and when your carrier establishes such a procedure, you will inform us of your resignation with immediate effect
?