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Here's my advice; get either of those which you can get since you do work for SJS!:
https://www.sjscycles.co.uk/accessories/thorn-accessory-bar-t-shaped-55-mm-extension-222-mm-0-deg/
If you have enough room under the stem, then you can mount that there, and not only it bring the bag closer but also lower mean the top of the bag line up nicely with the handlebar like those randonneur bag.
Anyone modified one of these... so it al sits closer to the stem?