Can't comment on the handlebars but if you're wanting to raise the height of your stem, several companies make a stem riser. I bought one.
After what happened with my girlfriend's stem riser, I'd be wary to use one.
She put a stem riser on her Novara Randonee for the added height. It worked fine. Then she put a front rack on the bike and loaded it up for a tour. The added weight on the fork caused the stem to come undone from the stem riser, while she was riding the bike. It was a bit unnerving, to say the least. And no amount of tightening made it work again. So she had to get a new, longer stem.
Handlebar risers may work when you don't have a load on the front end of a bicycle, but I would be cautious about loading up the front.