There’s a similar board with HDMI out, or you can use a VGA to HDMI adapter (no lag). Many people are already doing this.
I use it with my flat panels, one with VGA>DVI input and the other VGA>HDMI.
You can put it in a case, of course.
It has less lag than Framemeister as you can see in the video.
Anyway, for more scaler advice: Retro AV |OT| RGB, CRTs, Upscalers, and more