Sorry for self replying but I just had a look at the repo and it's definitely worth fully automating this.
A js/python snippet converting pngs to superwhite video frames should be fairly easy to implement.
??? It's just an all-white video, with an overlay of black QR code applied by CSS. It's already "fully automated."
Both (the video and the overlay) are small enough to be base64'd right into the HTML.
We can expect it is possible to create a much more compact video file with the same features.
In any case, that's not what the person I was replying to was talking about.