I never longe with a bit...it's easier to just slip a halter on over the bridle for ground work prior to riding, even something like this. As far as the reins, for the most part, when I'm riding at home, I use cotton reins, that have clips on the end, so if I'm doing ground work before I ride, I just un snap, and tie them up and hang them over my horn. It might be an extra step when I stop the horse, and prepare to mount, but I'd rather have to reclip them back on then risk the horse getting caught in them. However, I have different methods that I use to train a horse to stand still to be mounted anyway, although moving his feet is part of it.
"The ideal horseman has the courage of a lion, the patience of a saint, and the hands of a woman..."