‘Clairvoyant’ and ‘Card Carrying Member’ are both inspired.
I like ‘Renaissance Man’ and ‘Sage’, but if you are modest you might prefer ‘Apprentice Renaissance Man’ or ‘Apprentice Sage’. I suspect that many Mustachians would like to see themselves as one of these.
Samuel Johnson, in eighteenth century London, wrote a series of essays collectively known as The Idler. I may have read a few at school, and my hazy memory is that an Idler is an intelligent and educated man who has enough money that he does not need to work, but, either because of inadequate wealth, or by inclination, is not at the social level of a Gentleman. I am surprised to discover that there is a British periodical called the Idler, published since 1993. I not have yet found out much about it, but it seems that the ideas behind it are partly Mustachian.
I therefore recommend the term ‘Idler’.
Or for something completely different, ‘Galactic Hitchhiker’.