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Here's a magic gear generator: http://eehouse.org/fixin/formfmu.php
48x15 and 50x17 seem to be the other 2 magic gears besides 52x19. I wouldn't think 46x13 is a gear anyone would wanna run, but is also possible.
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Here: https://www.pedalroom.com/bike/ritchey-swiss-cross-disc-32054
Gevenalle just looks so cool, but somehow can't imagine it being nice to really use.
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Actually those headtubes aren't that small compared to the top tube.. At least in my size, size 57, the toptube is 575mm and headtube 180mm.
If you put that next to a diverge, which in my opinion is a pretty relaxed geometry, the 575mm toptube gives you a 190mm headtube. Only a 10mm difference. And you get a vulcano spacer/dust cover as well..
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You could just use some degreaser and a scour pad to just rough the surface a bit. Hopefully retaining the colour while still being enough to get it to stick.