Lol TS... Anyway, have you seen the karate fights they used to put in Pride cards? No grappling or clinching, but it was all body shots and leg kicks, no head shots allowed, plus no gloves. Pretty strange to watch honestly. But also kind of cool I guess.
I also think combat jiu jitsu with the grappling + open slaps is pretty cool. I would be in favor of the UFC sprinkling in some mixed rules bouts like that for fun, once in a while, but of course it isn't going to happen.
Your idea is pointless and of course would pretty much kill the sport. The ground with no headshots would be much less entertaining, and the standup would just be weird, as you can see. It goes against the entire spirit of what mma was conceived to be.
Plus, do you really want boxers to call us cucks and tell us they have the more realistic combat sport, and that mma champions can't take headshots? Whose side are you on man?