I've done this on my British Pullman-gangway knuckle-coupler-fitted stock, and it works fine (granted I've had to carve out slots in the buffer beam/headstock and retract the buffers), but it works and looks so much better, with hardly any derailments. Your videos are so informative and well-formatted; I was going to comment on the possibility of the coupler dipping but then the addendum popped up and the problem was corrected; my fault for not waiting to see it!

Anyway, fantastic, as always. Keep up the good work! - Alexandra