Might split the difference and leave a little belly, but not as much as is currently on it. I think that you might find that the blade geometry will get a bit complicated with a straight back and a deeply curved edge, as the triangle of the blade's cross-section will need to change dramatically in the rear half of the blade. In other words, if you try to keep the sides of the blade flat, you will end up with a blade thicker in the middle than at the base, so the sides will have to twist a bit to keep both distal taper and good edge geometry. Not a big deal with a slight belly, particularly if you use files and sandpaper instead of a belt sander, but with a deep belly it will be a lot more of a problem.
You will notice that Huntschool's blade is curved along the back as well as the belly, which removes that problem.