A quick test with the video loop updated to SVGAish mode. The differences being the 35MHz dot clock is 7/8th the speed of the true SVGA 40MHz clock. This means 87.5 columns of text instead of 100.

The horizontal frequency is also adjusted up slightly from the SVGA 37.879kHz to 38.377kHz. This is only a few hundred ppm away from the 38.4kHz UART speed. The TV is happy with this timing passed straight through the cheap $8 VGA to HDMI converter.