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I see in your photo you have bar end shifters on both sides so I guess this keeps things balanced. My thoughts are more that having a bar end on one side slightly extends the bar, which I guess isn't to a great amount of detriment.
I guess the best idea is to set it up and take some time to see how I find it when actually riding. I'd probably only need to remove a centimetre of bar so maybe it's a negligible amount!
Thanks for your input!
No
Because the shifter doesn't change my hand position
However much you want to. The only reason to do it Imo is aesthetics, our because you're catching yourself. So whatever you think looks good or whatever you need to stop yourself catching.
If you have metal bars a pipe cutter is easier and usually works better ime. If you have carbon bars, a fresh hacksaw blade and breathing protection.