Anything is possible. What's wrong with the "look" of the 7/8 bars? You'll have to make adapters for the bar clamps, unless someone out there has already made them. A lot of work for very little gain IMO. If I did that, I can imaging the ribbin' I'd get from my HD buddies.. ..
(who, by the way, have all parked their 1" bars for the winter.)
...of course, you could shave the top tree and put your own bar clamps in. Do that and weld on some new risers. Or just weld-on some new bars. Lots of ways..
I like my stock bars. I did change my bar clamp though. From a Honda 450 twin. It's a full cast piece. I thought of making one but came across this instead. I've a control-head to mount there. This gave another option.
The bars won't fit the clamps, the clutch, brake and switches won't fit the 1" bars so it seems a lot more trouble than it's worth. Hard to tell 1" from 7/8" bars from very far off anyway. If you want taller, shorter, wider or narrower bars just get what you want in 7/8. If it's fatter grips you want just get fatter grips.
Thanks. It's surprising to me to find so many interchangeable parts from other models.
The 450 had a new choke cable on it as well. 5" shorter than a GL cable, but exactly the same otherwise. Perfect length for my carb swap should I ever change it to a manual choke.
I run one of the shocks from that bike too. They were new replacements on the 450. One air-spring and one conventional spring on the 1000. Like a 1500. I blew out a seal on one of the air shocks, so it seemed right to me. Works well.