Originally Posted by
neilfein
...
I have been considering switching to moustache bars, but that would probably require new shifters and levers. Slightly wider bars might alleviate that problem as well as allowing me to install a decent-sized handlebar bag. ...
You can use your existing shifters with moustache bars. They will mount horizontally, rather than vertically; and this will change the hand motion required to shift, but it will still work. I cannot predict whether you will like it; I used to love moustache bars but for various reasons am not using the one I have now.