Did you ever flower a male that you transformed into a female?
That is the best way to guess what a male might contribute to progeny. You can smoke or analyze the transformed male to female and see its cannabinoids and terpenes.
See: https://www.icmag.com/ic/showthread.php?t=99597
Seeing and growing a lot of progeny from many different females crossed to that male is maybe the best way but it takes years and years, and if you are limmited to what you can do, a lot longer then that even.
-SamS
This is genius! Does the ethephon pose risks to the female plants...does it need to be done in an isolated room?