Chris -
The concern for hamstring strength is largely unfounded - the more upright pulling posture does use more quad than if the hips were higher, but there is still a tremendous demand on the hamstrings.
There is no reason a more upright pull would negatively effect the deadlift - it would just start changing your deadlift style to a more upright position because you'd be stronger that way instead of the higher-hipped way. In either case, you're lifting the bar from the bottom to the top.
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