The originators and financers of #nevertrump are the neo-con artists and their open-borders toadies. The neo-con artists are perfectly happy with Clinton because she did their bidding in Libya, and would gladly repeat the process wherever, and whenever they tell her. The open-borders toadies are perfectly comfortable with Hillary for very obvious reasons.
I like your term “neo-con artists” and assume it has the secondary meaning of “neo-con con artists.”