You can get a taller threadless stem adapter like this from Velo Orange http://www.velo-orange.com/vothstad.html
Combine it with http://www.velo-orange.com/vost17ri.html or http://www.velo-orange.com/vost625.html and you'll get plenty of height.

However, in truth, from what you have shared here...... the frame is just too small for you. A stem is meant to compliment the fit of the bike ..... not make or break it.