I'm typically hesitant to recommend a Cannondale with a Headshok - but if you could find an old Cannondale mountain bike equipped with a Headshok (in good condition of course) it might provide the upright position you are searching for
many of these bikes were ridden with the stem in the reverse ride position - so you could possibly get a more upright position with the stem 'flipped' (positive rise) and a riser handlebar