Mick, I love the pics; thank you! My 750 has a fixed stem that's fairly low, but 120mm long. I have a generic black adjustable stem (probably Promax or something) off a salvage bike that I plan to use to test the fit and find the best position for me. I have it on my 750 now, but my cables are too short at the moment to raise it up much, and I figured that I'd wait to do new cables until after I get my trekking bar setup. I ultimately want to go back to a silver/anodized stem color like what came stock on these, once I find the right fit.
I don't recognize your shifters/brake levers. They look to be a combination twist shift/brake lever from Shimano? Interesting.
I have EF51 triggers on mine, but most folks with trekking bars seem to use twist shifters. I do like how low profile they look.