This might help:
I started using cyclocross brake levers to take the pressure off my shoulder when I had shoulder surgery. There is plenty of room between the bar bag and the levers.
There is no need to retape the bars, unless your bike's bar tape is close to the bar. Even then, all it would take is to tighten up the spacing of the last 5 wraps of bar tape. There is not any "sway" with the Ortlieb bar bags. They are pretty solid.
A different bike, but it is the same setup.
This is the best side view I could come up with. Check BIke Tires direct. The Classic 6 bar bag is on sale for $77. It will give you the savings when you put it into shopping cart.
https://www.biketiresdirect.com/prod...-handlebar-bag