Steve,
You don't want to hear that your efforts would be better spent on finding a bike that starts out better suited I'm sure, but that is my first recommendation. The Wing has a lot going for it, but they aren't great on gravel.
If you insist on using the Wing for whatever reason, (and you have the ONLY Wing I wouldn't just say: forget it!) focus on cutting weight, and keeping it simple.
Definitely not worth switching to spoked rims. Way too expensive and probably too difficult for the limited benefits. (less weight, but not much, and less susceptible to damage, and when damaged a rim is cheaper than a wheel - BUT the swap will cost as much as new wheels...)
suspension: if it doesn't bottom out leave it. DO change fork oil to manufacturers spec. Progressive SPRINGS are great.
tires: pick a good universal pattern e.g. Metzeler Enduro IV or similar. Anything the big trailies e.g. R1100GS use is good IF you can get it in the right sizes.
windshields or fairings: minimal, clear plastic - see
www.Rifle.com or your dealer for small simple light shields.
electrical: no reason to change anything.
hope it works well for you!
------------------
Grant Johnson
Share the Dream!
at:
www.HorizonsUnlimited.com