The Pioneer PX-V7: MSX over all?

To capture a composite video signal and display it on my computer's output, I need to use an upscaler that converts to an HDMI signal, then an HDMI capture device which in turn communicates with my PC over USB. Then, I can overlay my stupid face over it and send it to Twitch or something. But what if it was 1984? Of course, Twitch wouldn't exist, nor would HDMI. So what's the next best thing?

Ah, the MSX. Most people focus on how popular it was in Japan, but they rarely mention that, because of the involvement of the Dutch company Philips, the MSX was also remarkably popular in my country of origin, The Netherlands. Some of my earliest computer memories took place on an MSX at a friends' place.

The particular model of MSX in this article, however, is something entirely different from the kinds of MSX machines I ran into as a kid. This thing has a considerable number of tricks up its sleeves, and now I just know I'll be spending considerable time on eBay.