I got 7700K and Asus TUF Z270-Mark 1 working using FakeCPUID 0x0506e3. Everything seems to be working including Speedstep and sleep. The only thing that I still can't get to work is the 2nd Nic port (Intel 219V), IntelMausiEthernet.kext doesn't seems to work with it. Oh, and it loses internet connection on Intel 211 (using AppleIGB.kext) after it wakes up from sleep. I have to turn it off and on again to get it to work again, no need to reboot.
Update:
Intel 219V is finally recognized and working properly with IntelMausiEthernet.kext after the latest bios update(0701). Intel 211 still loses connection after system wakes up from sleep but Intel 219V seems to maintain connection just fine.