SO what were getting here is a road bike (light, fast, aero position) and an upright bike (usually heavier, slower, non-aero) are apples and oranges.
Some sort of compromise is in order. I'd suggest a road bike with low rise mountain bars, but with an assortment of mountain bike "ends" attached:

1. Straight or angled ends, moved to the middle....
2. Gripper knobs, on the bar ends....
3. Drop ends, just inboard of the gripper knobs...

The angled ends (1) offer a laid out, relaxed aero position. The gripper knob ends(2), provide a more upright position. The drop ends(3) give the more traditional tucked aero position.