CEC passthrough

Have an lg tv in one room and a projector in another.
LG TV is connected to RPi3 with OSMC on top and i fell in love with this configuration. Everything worked out of the box. Remote controls from TV remote e.t.c

So i decided to connect a projector (which was running of a Win7 machine) to OSMC as well.
Projector is connected to an Onkyo NR709 receiver which supports two HDMI outs. So the LG tv went into the primary and projector to the secondary. Video and audio working straight away - but lost the ability to control the OSMC from TV remote. Any suggestion will be highly appreciated

Try some of the suggestions here;