There is quite a range of 'mustaches', from his toothbrush mustache to the FooManChu that extends into Anton La Vey's beard. Neither extreme is particularly appropriate IMNHO.
Personally, I have worn a mustache all my life, as a memorial to my father, that has come to be more like David Suchet's Hercule Poirot mustache, but, again, not so extreme.
I think your good question is just the perennial question, on first impressions and their value/cost, asked again. Gun nuts (with all due respect and present company excepted, of course), the ones that are tattooed, pierced, mod-ed (new meaning to the 'Mod Squad') and raggedy-assed, don't do your movement any good.