And it only needs to be done once per lifetime per athlete - unlike drug testing. Get tested at your first Olympics - or an internationally agreed test which covers the World Championships and Olympics - and you’re covered for the rest of your career.
It would in a short matter of time end the issue completely because scouts who have been prepared to exploit this loophole will know it’s pointless.
And then they can actually put their energies into scouting for women to train and support.