I used a Microplane cheese grater (dedicated to soaps) to turn most of a puck of Mitchell's Wool Fat into one great smelling shave stick.
The local supermarket had Brut deodorant on sale for $1.99 a stick. At that price I snagged 2 and chucked the deodorant part in the trash. The label is a clear plastic sheet so that came off cleanly. The smell of Brut washed out with dish-washing liquid and some elbow grease.
I think the Brut deodorant push up container is one of your best bets when you are pressing the soap flakes into the container. Twist up sticks have somewhat fragile threads. MWF is fairly soft so you can jam it in there. Just don't push so hard that you distort the plastic tube. (I've done it)
Can't wait to try it out