Eh... the Demi-fiend doesn't have a canon height, though neither does Dante, so there's nothing for comparison. He's taller than Isamu and Chiaki, but shorter than Hijiri and Hikawa, so assuming he's average for a Japanese boy his age, he'd be about 5'5".
You're not 5'5", but as you say height doesn't matter as much as build, especially when one cosplays alone. The trouble comes if you want to cosplay with others. At 5'8", no Dante short of 6'2"-6'3" will look even remotely accurate (and even then, not terribly).
As for build... I hate to disagree with you on this one, but I really don't think you do. Not even close. He has no ass whatsoever, and that's really going to show with those shorts.
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You're not 5'5", but as you say height doesn't matter as much as build, especially when one cosplays alone. The trouble comes if you want to cosplay with others. At 5'8", no Dante short of 6'2"-6'3" will look even remotely accurate (and even then, not terribly).
As for build... I hate to disagree with you on this one, but I really don't think you do. Not even close. He has no ass whatsoever, and that's really going to show with those shorts.