If possible don't cut the stearing tube. I hope it doesn't come that way. Then get a lot of washers to stack. In the attatched pic you can see about 3 or 4 spacer washers above the stem. The top of the bars is about an inch above the seat. This is an old picture, back when I had a good sized belly. With washers the bar height can be easily adjusted on the tour, with just a single allen key. Maybe not as easily as with a quill stem, but easily enough.