To some extent given the degree of the slope, it is not clear if the problem is the need to reduce the height or just to add stairs.
Another option is to potentially identify the best place to put the door based on the sampled ground elevation of each side shape, but I am not sure elevation sampling is that exact.
I am curious if the resetGeometry and scope.elevation functions/elements would help here, but I have not gotten to test them that deeply.
David Wasserman, AICP