Well, if I were doing that it would probably be with an AJA Io 4K. I want it but the reason I'm not using it is that it costs $2K and I can't justify it right now. I'll get one as soon as I can. For now I'm just looking at my image full-frame on a 4K monitor, basically as an extension of the desktop. It's not optimal and it's not what you're looking for.
From what I've read, there is a BlackMagic box that does the same thing as the AJA box, I think for a similar price. But I understand that the AJA box is a lot quieter. I don't know of any other options.