yes i plan to install camera in same place like your car.

about the problem :

i well take the power for camera from ignition wire (yellow & brown) in trunk and i well try to find that sh-- wire

but the aftermarket video module have blue wire take (just) the (pulse) from reverse light (not take power) this what i undestand by user manual that for change screen to reverse mode.

and this thursday i well do my project

but you must be change your taillights to facelift tailights, like me

i well take photos for my car and attach it for you because i add wondefull items to body by my self (DIY)