Current update..
will leave KExt as just a feedback and logging tool. until I learn how to write to the Hotkey Device.

just by modding the DSDT, I got the following to work.

1. Display panel on/off.
2. WIFI / Bluetooth on/off. - (currently WIFI cannot be turn on after you turn it off.)
3. Card reader on/off. (no graceful dismount if you have media in your Card Reader)
4. Onboard Camera on/off.
5. Brightness control.

I am using BCM94321MC for WIFI, I think that might be the cause for the WIFI on turning on.

and few other mods not related to this KEXT.
Will start a new thread to share my findings.