Is the current stems reach right for you? Remember as you go up the reach shortens. The Nitto stems are very common and are good quality. Search around and you can probably find what you need for 25 to 40 dollars. Try ebay.
Taking your bars out of a quill stem is not hard. Bars are also easy to rewrap and new tape can be had for as little as 8 dollars or less.
Otherwise an adapter would work, but if you have to buy a new stem to put into it you won't be saving any money.