i just stumbled across the gamestream settings in the gforce experience app and though...
"somebody must have made a 3rd party app for this already" and i fund Limelight: https://play.google.com/store/apps/details?id=com.limelight
so i grabbed my Oneplus One tried it out with a wired controller and a OTG cable.
it worked perfectly, so i ordered one of those: http://www.amazon.com/dp/B00KLS3UEY/
and boom, the Handheld Streaming Console is Complete!
only bad thing is the D-Pad sucks quite hard, and my Wifi doesnt reach the Bathroom all that well... ;D
(the Analog Sticks are suprisingly good though!)
just wanted to share this with you guys, i hope you like the Idea!