The reason I asked about this is that I did not have the Sony A7RIV, so could not experiment, nor the Atomos Ninja 5, so was looking for someone who was already doing this for answers. It seems for what answers I got here and elsewhere, plus articles I read, that it’s a lot of hassle to get a quality monitor to hang off the camera and then be able to magnify/de-magnify the image as I can do on my Nikon Z7/Z7 II or D850.
What I have come up with is to use the cameras I have and wait for Nikon to come up with something down the road that will fill the bill. I’m sure they will, in time.