Trekking bars are pretty adjustable,I'd try playing with them(and the stem) before swapping the whole bike. Might also want to consider a 'promenade' or 'townie' bar;one of my bike clinic's regulars got a Disc Trucker with one and really likes it. His other rides were a Sirrus and Crosstrail,both of which had adjustable stems that put him upright.
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