That camera on the link is perfect!! That's exactly what I am looking for. I will ask my dealer if he knows how to make it compatibile with c4. I am sure I'll be coming back here for help with that, I already know his answer
Otherwise, if I understand you correctly, another option is to use 2 portable TS's, one next to the crib and another next to our bed, and leave the setting to monitor, will it have night vision??