This should have been a minimum font, but minimum can't do color.

The idea was to simulate transparency. After trying out multiple color hatch patterns, it was apparent that it is not going to work. The earlier attempts are left in the font for you to judge yourself their efficacy.

The file is pretty heavy because of having so many anchor points (times 8 layers). Scrolling will be slow. Because the next letter overlapping the previous hides part of the black outline, just outline glyphs are there to stack two layers (colored below, outline above) to get the correct effect.

Is there some trick to make the downloaded font to work in color? The version I downloaded comes as *-svg.ttf. Aren't the color svg fonts in .otf format? Thus, no sample.

I bet I thought of this kind of crosshatch...
Added Kerning...
File is 521KB and it works!!