Ndisplay cave, without blends/warps without Mosaic?

I’ve been asked to take over a cave project that has been developed in Unity 6 outputs, 2 blended on a ceiling, also needing a little warping as the back projection screen sags a little on there. I’d like to remake it in Unreal, because it will look better and be easier to update. Trouble is the system is using gtx1080’s not quadro’s so I dont have access to mosaic. Is there anyway to post fx onto the outputs individually, ie target them through blueprint, so I could add a blend region or do some warping? Thanks