Its possible mate, changing the triple trees to suit.
I like Free Spirit's work. they would make a custom set to suit whatever width i want, and they also do Brembo brake adaptors, among other great things, which would be cool, but costly for me, at the moment
http://www.freespirits.it/en/products-hd/triple-trees-hd.html
being a new platform, its still early days with the mods and aftermarket gear, which sucks, but there are some promising things in the works that i am following closely, forward controls, a guy who is doing chain/sprocket conversions, and most interestingly for me, Spoke wheels that are larger, i think 18" front and 16" rear?
I'd really prefer same fat size front and rear like the 48's tho
Some really cool customs coming out during this Battle of the Kings
http://www.bikeexif.com/harley-street-750
http://www.cycleworld.com/2015/05/20/harley-davidson-battle-of-the-kings-custom-street-750-motorcycles/