Wildcat make a smaller pouch that fits in that Jones hole too.... UK based as well
http://www.wildcatgear.co.uk/shop/handlebar-systems/tom-cat/
Straps on that are only on one side though so it would be flapping off one aerobar.
These style of bags won't work with my light bar either but then I'll probably be using a brake-mount dyno light soonish so that problem might go away.
@stedlocks started
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Wildcat make a smaller pouch that fits in that Jones hole too.... UK based as well
http://www.wildcatgear.co.uk/shop/handlebar-systems/tom-cat/