With the help of I was able to get Top Over Bottom video working using the the following shader setup.
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Using this Material and switching the U and V values worked for me with my side by side stereoscopic video playback, 3840 x 2160 30 fps. I made a quick sphere and flipped the normals so i didn’t have to make the material 2 sided. Getting 90+ fps in UE4 4.15 on Oculus. Will test on a Galaxy 6 Gear VR in the next few days and will report back if something unexpected happens