Aerobars, like these:
http://www.profile-design.com/profil...airstryke.html
I nearly gave up touring in the early 1990s due to hand problems. I starting using Airstrykes in 1994. They saved my touring "career" by giving me a riding position that requires no gripping. On the road, I rely on them for up to 50% of a typical day.
Just don't use aerobars in traffic, or any time you might need quick access to your brake levers!!!