On reasonable budget series I work on lately I send a Comtek signal on an Option 7 PR216 to the Qtake operator, and get an SDI single cable with however many cameras are being used on it already split screen for my 19 inch feel world monitor. Fortunately for me, the feed I get is not the take signal, just a composite of the video feeds used in the QTAKE input, so the latency is mostly from the Teradecks on cameras.
I bought a Decimator when I got the bigger monitor, but never had to use it. But of course I don't use video on every setup, only when it is convenient and lots of sources to check on.
Different strokes for different folks.