Thank you, and no, I haven't. Make wheat flour noodles at least once a week. Its easy. I should get some buckwheat and try. My diet leans more Mediteranean than Asian, so its not something I'd previously considered.
As [an amateur] someone who makes noodles....
Not really. You have two issues there.
One, you need long string starches, or binding starches, to make noodles. That's why gluten noodles (wheat flour based) work so well. There are, of course, other options - but to get "noodle" tooth and...