Good point Icefire, there is no need to jump start cycle when using LR. Even if LR is cured (assuming you get it shipped) there will be some sort of cycle. Depending on amount of die off on LR it will be long or short one. But again, you dont need shrimp thing.
From my experience (limited but none the less) I've done LR curing in tank and outside of the tank, I'd suggest curing it outside of the tank. This way when LR sheds junk it wont get trapped under the sand. In any case, good luck!