Standard/Tourer handlebars are actually 1/4" longer/wider than IS bars (1/8" on each side... Duh).
This is an issue that comes up from time to time. A few have changed out to a (no riser) drag bar with a straighter profile grip and shorter/narrower bar, but the problem is finding one that has the rise (6-8") and pullback (14" or more) you need with the Honda 100mm/4" riser spacing (not the 3.5" Harley/Kawasaki riser spacing). Then you have to measure for longer cables and hoses, and get it right the first time.
It is said the Yamaha Venture handlebars are very similar to Valk dimensions, but an inch or so narrower... hardly seems worth it.
If I could get set of drag bars that fit me perfectly and I knew the correct length hoses and cables to get in stainless braid, I would do it. I have looked (over the years, not lately), but cannot find anything that comes close. It might look a little strange on the IS with fairing, but I think it would improve handling and comfort for me at 5'9", and also think it would be easier to countersteer the darkside tire with them too. It's a big expense and a fair amount of work to experiment.
Like these:
