Well, I've propagated them by pulling them off the mother plant...usually, they are dangling by a leathery, fingerlike root...and simply slipping the root into the soil till the little plantlet sits flush with the ground.

I cant' tell how tall your Sempervivium is...perhaps you could strip off some of the lower leaves and replant it, or cut it and put a little rooting hormone on the stalk, and plant it in a bowl or some other shallow type container. Now mind you, I haven't done that with a tall-habit Hen and Chicks, but these things are pretty tough. If it were mine, and I wanted a short one, I'd maybe try it. But I make no guarantees that it's the safe or right thing to do.

It may send out some pups on it's own. If it does, you can experiment with those without risking your mother plant.