Why not just find out where they are setting up these socialist voter sign ups and put up a stand right next to theirs to sign up conservatives, and trump supporters. Let them do all the hard work and have some MAGA supporters used their venues to give the people another option.
Most of these people are clueless one way or the other what party they are signing into and what they represent. Just have a slogan MAGA supporters for gun safety, protecting you and your children, etc etc. Sign up here and vote for [fill in blank]. OR … Something along those lines.