Far from me to want to exclude a Purist. What a horrible thought.
However, you could conceive that people that were not born in 1964 and that are not Purists, but who admire people that combined these two caracter traits would want to join.
In an association you would have to take them on board (rightfully so), but not in an "amicale". An amical is more exclusive, a little snobish maybe.
Hey I will follow the flow.
Best regards,
George