[Dak]

The initial question was: is it possible? You can get over that bar with just one counterexample, so it appears the answer is probably yes.

OTOH, Django Reinhardt invented a whole guitar playing genre and wowed the world for decades, with only two fretting fingers. Jeff Healy was blind and played his guitar lap steel style, and was probably on par with the best blues jammers in history. Beethoven composed some of the best music ever written while completely deaf and half-mad. Almost anything is possible for the best of the best, but they are extreme outliers...

My objection to using flesh finger nubs as picks on a nylon string guitar is that it is definitely a handicap. It makes getting a good sound, which is already hard enough for normal people who aren't world-historic masters, vastly harder. To me it seems like trying to reinvent the wheel. If you don't have suitable fingernails, you are probably better off changing strategy at a fundamental level, like playing a different instrument or a different guitar style, than trying that much harder than the next guy to get a similar outcome because you are fixated on playing traditional classical guitar.