Firstly, this is theoretical, right? If you want an insurable, government sanctionable format, you have MMA and San Shou, and all the karate formats where Kung Fu can play.
What you are looking for is a format where Kung Fu can shine, and not get doused by rules that diminish its strengths, yet protect the players from getting maimed or killed, right?
Women vs men? Why? Everybody knows the answer, its not a freak show.
I like the idea of long rounds. Can you say “Rope a dope.” Survival is a big part of any fight, as is heart and strategy.
What about the arena? Simple Boxing arena, or mats? Maybe something bigger, something interesting, like a padded platform in the middle or other environmental obsticals to use - use as a mobility tool, leverage point, or whatever. The idea being to add mobility to the game.
If you allow attacks to elbows, like arm bars, why not allow attacks to the knees? Most kung fu guys are trained to deal with lower leg attacks.
Allow groin shots but require Cups. Not shots to the back of the head or the spine as well as eyes and throat.
Bare handed or with MMA Gloves?
Pants and t-shirt, the kind that tears, not something you can use to grapple with extensively, like a gi.
I like the idea of more weight classes. I like the idea of getting an extra point per round for style too.