Remote Decoder For Hik/Lts Hdoc System

Happy Thanksgiving Eve! I have a client for whom I installed a 16 channel 3MP HDoC system, and they now need to put a monitor displaying only 4 of the cameras in a specific location. My DVR output is taken, so that isn't an option. Were they IP cameras I could easily use a spot monitor, or even a cheap NVR, but I'm not sure how to make this work. Any ideas?

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