Belated thanks to everyone for the handlebar bag recommendations. The adaptor on the Rivendell site is a bit pricey for me, so it looks like I'll have to turn to the resident engineer for a possible solution.
I wear a fanny pack while riding and that is not a problem-except on the hottest days-but it sometimes would be more convenient to have a handlebar bag for my keys, wallet and phone.
1990 Univega Alpina/(stock) gel saddle
2009 Specialized Dolce Elite/BG Lithia saddle
2009 Jamis Coda Sport/Selle Royale Respiro saddle
2010 Jamis Aurora/Jamis Touring Sport saddle