Can I add headset spacers below an adjustable stem, specifically the Promax A-headset stem on the Cannondale Adventure 1? I want to change the stock handlebar to something with more sweep, but most options I've looked at have significantly lower rise than the stock handlebar. I was hoping that headset spacers could compensate for the lower rise. I know I could adjust the stem, but I worry that this would mess with the reach too much.
In particular, I'm looking at the Velo Orange Seine (40mm rise) and Dimension Urban Cruiser (50mm) which have less rise than the 60mm on the stock handlebar. I've tried the Velo Orange Tourist bar, but I found that they are too narrow (570mm wide), and I want something with less sweep than the 53 degrees of the Tourist. The Velo Orange Klunker (76mm rise) bars are also an option, but I would prefer to have handlebars without a secondary bar like on Klunker. Another good option is the Fairdale Archer v2 Cruiser bar (50mm rise). I consulted my local bike shop, and after measuring my hand position, and they recommended I get handlebars about 610mm wide.