I appreciate the fact that you are thinking outside the box to come up with a solution. I think that is what is going to have to happen at some point.
I don't know that much about testosterone levels - how much do they vary naturally? Like if you tested 100 born male athletes would their testosterone levels all fall within a pretty narrow range - or what? Do champion athletes within a gender typically have higher testosterone levels than lower performing athletes (assuming none of them are juicing)?
Testosterone levels are very variable among human males.