The blade stations on a fixed-pitch prop are pitched to keep the entire blade at about the same angle of attack, with some changes depending on what the airframe manufacturer specifies. Some might want a little more pitch inboard for better cooling on the ground, for instance. The should be no part of the blade airfoil causing drag from negative AoA when the prop is pulling. The IVO, with its non-changing blade root, might have a negative AoA, or at least no AoA, in cruise.
The ideal prop, as I said earlier and Marc Zeitlin said, would have the roots changing pitch more than the tips to keep the whole thing at an ideal AOA. That would be difficult to do with the usual constant-speed prop technology. Maybe a long rod having a specific torsional flex that ran through the blade from the hub out to the tip, with the tip end fixed to the tip and the hub end fixed to the hub, and the root end of the flexible prop blade twisted via some mechanism, could get close to ideal. The hub would twist more than the tip.
Ideas are a lot easier to come up with than to implement.