I connected the My Buds to the Nvidia Shield K1 via HDMI cable (I don't have the DJI HDMI module) and they work surprisingly well. I need a shorter HDMI mini cable (1 foot should do it) but am encouraged by the results. No lag, no pixilation. Its not pure HD, probably 720P but for FPV, its plenty good. Plus, I don't look like a total dweeb as the glasses are MUCH smaller than what others strap to their heads.
Wearing prescription glasses creates some challenges and I wonder how they will work in direct sunlight but for now, so far so good.
I have the Nvidia Shield K1 like yourself and a phantom P3P but I cannot find the "My Buds" you recommend anywhere. Did you mean "view buds" thats the closest I could find?