Never heard of rooting from the leaves, I suppose it could be done. Maybe air layering might be a choice. I have 2 huge aloes in pots and they just keep pupping and pupping. Same thing with my Agaves, I am going to have to re-pot again this year to separate all the pups...WANT SOME... Think I have about 30 right now and it pups again during the summer.
Andi