I know that this is an old thread but I thought that I would revisit this with some additional options for any one in the same boat as there is really no way to convert the bike to a straight bar due to the brakes and brake levers. Believe me I tried. You would have to change out the entire brake system.
Here is a 70 degree adjustable stem that I came across which is 10 degrees more angle than what was previously available.
And you can buy short reach drop handlebars with a rise from anywhere from 10mm to 50mm-
The Surly Truck Stop Bar is a traditional drop bar road handlebar with 30mm of rise for a more upright and comfortable riding position.
surlybikes.com
In terms of both comfort and performance, anywhere that your body touches the bike is of the utmost importance. That's why we designed the Hover Expert ...
www.specialized.com
I am going to buy the Surly HB.
Larry