Whatever floats you boat mate. Just because I reckon you'd be bonkers to do it doesn't mean you shouldn't.
I posted this pic the other day (apologies to those who've seen it enough) and think it's really well done and not all that bad looking.
I guess I struggle to understand why you'd want to take away some of the things that make a Rocket a Rocket. Riding with 30 other blokes on the way to RDU at Hervey Bay last September, the most magical sight I've ever seen (slight exaggeration but never mind) was the two rows of double headlights in my mirrors when I was up front. The best sound in the world was riding at the rear, by the way; 30 or so Rockets thundering through the Queensland countryside. I digress.
If you think that second headlight is annoying maybe that third cylinder will prove too much for you as well............... Walk into any Harley, Vistory, Honda, Susuki, Kawa or Yamaha showroom and there's a huge choice of cruisers with single headlights and 2 cylinders just waiting for you.