You mean lop a cylinder off the 500 the way Buell lopped a cylinder off a Sportster engine to make the Blast? Well, not like it hasn't been done before. Didn't make for a very enjoyable bike though.
I think Harley should make a premium version with double overhead cams, dual throttle bodies and a centrally mounted spark plug. Make it an 800 or 850 and go head to head with the BMW F800 series bikes. Then retire the Sportster line for good. Bury that 57 year old pile. It was obsolete in 1957.
I live in a parallel universe but have a vacation home in reality.