Is there a way to render Actor if occluded by another certain actor?

So i have a problem similar to this one Material pixel depth offset and shadows. - UE4 AnswerHub but i cant use pixel offset because it messes up with shadows.
Basically i want to force an actor to be render in the scene even if occluded by another particular actor (and only this particular actor, other actor should really occluded it). I been trying things with no luck, so i think this will require editing the engine. Any suggestion on how to solved this or where to start looking?.