Thanks very much for the additional details. I did try that Mokose SDI adapter last year but ultimately returned it as I was searching for lowest latency (my main application is Image Magnification) and my Thunderbolt based BlackMagic UltraStudio Mini had lower latency and resource usage. However, I don’t recall having frame-drops at 60fps, so perhaps I should get another to try…
The Syphon route is an interesting idea too…