Consider something on the Outside/inside reverse avalanche.

Masters in Pattern has a very similar avalanche last and this next year. Only difference is it doens't have the 1/2 roll. The IMAC manuever is actually easier if you think about it. The 1/2 roll is prior to dead bottom, the snap should occur directly after dead bottom. A positive snap usually will gain a slight amount of altitude if you let it, helping to keep the radius. With the avalance in pattern, the middle of the snap should be at dead bottom, and getting a snap to start on a downward slope, but end on a slight upward slope is extremely difficult.

I am anxious to try this new sequence.

As far as the Humpty, practice it both ways. You may have a 20 mph wind blowing you in or visa versa, blowing you out. If you are at an Advanced level you should be able to snap either way, just a matter of putting it together either way. This will help your confidence in a contest.

Ed