In addition to all the suggestions above, there are a few things you can do to help with your thottle hand issues...
1. Search the Forum and find the directions on how to allow one revolution of the throttle spring to unwind, thus reducing the force needed to open the throttle.
2. Fatten-up those skinny grips on this bike. You can order the Grip puppies, or be innovative in other ways on just how to fatten up the grip. Fatter grips change the required force ratios and make the throttle grip seem easier to roll on.
3. Install a Vista Cruise. (another forum search) Vista Cruise is a throttle locking mechanism that I find invaluable. I can't tell you how much I use that darn thing on every ride. The minute your throttle hand seems a little tired, flip on the Vista Cruise, take your hand off the throttle and keep it off as long as you like. For roughly $30, I consider it a must-have farkle for this bike.
4. Keep at it...your metacarpal muscles and wrist ligaments will strengthen as you continue to ride.
As far as the riser, I suggest you ride the FJR for a couple of thousand miles before you start passing judgement on the bike and how it's affecting your ergonomics. Sure, a riser might ultimately be something for you, but it just as well may not be. Either way, you really don't know right now cause you havent been in the saddle long enough. And give the stock saddle a chance..you see lots of bitching on this forum about the stock saddle. My experience is that the more you ride it, the better it gets and conforms. That said, there are lots of good aftermarket saddles if that ever turns out to be an issue for you.
You have a great bike. We all do. Ride the thing for a while, then after that, you can make changes to improve issues that the stock configuration consistently presents that may be affecting your comfort or ride enjoyment.