Cup method to grow loose lettuce within 40-50 days? Black Seeded Simpson

http://homeguides.sfgate.com/grow-lettuce-cups-69242.html

I have Black Seeded Simpson and instead of growing it in the garden, it might just be easier to grow it this way. I already grow alfalfa sprouts because I like to have crunchy greens available. Would this be kind of a similar method of growing lettuce? Obviously lettuce takes longer because it is more developed, but I could probably figure out a way to keep a half dozen cups inside year round if they produce well.

Thoughts?