Denying reality, even with the best of intentions, ultimately does everyone a disservice. We should of course encourage intelligent and driven women to succeed. We can do that while acknowledging that, yes, brilliance is more common in men.
I don't know, right off. May well be there isn't any such "measure", for the higher end. Especially none as highly contention as that provided by so-called IQ tests (which in any case were initially intended to sift out mental retardation or developmental disabilities -- not for stack-ranking cognitive performance in upper-tier adults, for which their applicability is even more suspect).
The bigger point is that it doesn't do much good to just pretend that it's a valid, object measure of "brilliance" when most likely it isn't.
Education is a prerequisite for making best use of one's intellect. Do you propose witholding education from boys so that adult outcomes are more equal?
Your assertion that brilliance is more common in men than in women is unsupported.
May I ask what measurable yardstick of brilliance you would use, if we are to eschew the most widely accepted yardstick?
Or are you just moving the goalposts because you don't like the current answer?
You are free to assume whatever you like about my motives, and you can claim it's moving the goalposts if you like: There's also a racial bias in IQ test performance. Would you therefore argue that e.g. black people are less brilliant than whites? Or Asians?
If you can accept that there are people smarter and not as smart as you, more athletic or not as athletic, then you understand that people are different. The illusion that races aren't different is just part of a passing PC culture fad. Better to accept reality, better for everyone involved.
I'm afraid that's not an acceptable answer. I'm rejecting your viewpoint in favor of currently accepted mainstream psychology until you can back it up with measurable fact.