I was using the Shembiner on my MB. Loved it. As I started to do crane work regularly, I couldn't wait to replace it, and bought a Transporter. Everything was falling into it at the worst times. Climbing rope, saw lanyard, crane eye to eye slings, brush, .....
The buckclip would have negated much of that except, it wouldn't have helped with one last issue. Descending down to make my cut, in a brushy tree, my saw would get caught up and the lanyard sometimes found it's way out of the Shem. I'm much happier to have a lockable gate.
I'm stream lining my MB 1.0 for lightweight crane flier. When I get an MB 2.0 for regular removals, I'll put the Shem on it. I like the Buckclip idea, and will make something out of flat stock aluminum to fit my MC rope saddle. When bending aluminum it can be annealed, with acetylene, making it easy to bend without breaking.
Great idea with the flat stock
@Tom Dunlap