What about gluing the flat part of a big nail or something similiar onto the bottom of the base and then drill a similiar sized hole in a piece of wood. Insert nail in wood and paint that way? You should be able to do it 1 handed, with a little hunching over. You should be able to at least base coat detail might be out.
Just an idea.
That's how I paint my model's when I use the dip method on.