I believe that some of you have had this kind of feeling/experience before so I'd really like to hear how you handled it..
Patience. Think of it as you are bring these folks up to the level where they can do the fun stuff. How else are you going to get a variety of well trained folks to work with if they don't get trained?
If your ukemi is uncomfortable with beginners you have got a huge hole in your skill set that needs a tremendous amount of work. $0.02.