You write "Although Lion Rock is just a short distance away, the two peaks are separated by a difficult serrated ridgeline. (There are no entries in the summit register describing a direct traverse between the two peaks.)" I traversed from Lion Rock to Stewart, and found it mostly class 3, with some stout 4th class, with careful route-finding. Going the other way would be harder, since you would be going down the crux, which involves climbing on the NW side of the ridge to get around a steep step after the flat, block-maze part of the ridge.
"As an adolescent I aspired to lasting fame, I craved factual certainty, and I thirsted for a meaningful vision of human life - so I became a scientist. This is like becoming an archbishop so you can meet girls."