Dennis, you might first verify the loading on the ridge, since the ridge will bear more weight than the individual plates. This I believe is critical in a tall posted cape scheme, where simple bearing capacity of the ridge will prevent spreading at the plates and stress at the lower ties. So identically sized plates and ridge may not be appropriate. When you size the ridge, you should consider the reduced cross-section at the joint as the true beam size especially if you are cutting grain on the upper or lower third of the beam where the stress on fiber is greatest.
My choice, for simplicity, is a bearing housing on the upper side of the ridge with a sloped ledge, butted and strapped at peak and birds mouth cut into rafter. I would prefer the half-lap at the peak with pegs that have a knob on one end and kerfed and wedged at the other end.
