We have a dancer here in Buffalo that has a hard time hearing and ear-mind process-motor response time is very very slow. (I worry about him driving). We have a loose house rule that the regular good lady dancers pair with this gentleman. Otherwise he will ask newbies to dance, and often is at the end of the line, after the walk through. When you dance with him you have to call to him through the dance and guide him to where he needs to be. This is how we have dealt with our own issue.
In your case, you might want to invite him to your beginner's workshop where you can address some of the issues you have seen him experience (i.e. the 1/2 alemande instead of the 1 1/2 of the call, or a shorter swing. Play up the better never than late thing and talk about flourishes and how they are not really a necessary part of the dance experience.
the others have mentioned other ideas that are really good.
Good luck Marie!
Mary in Buffalo