Been thinking about this. If you have glued the blades to the hub I don't know what you can do, but if you have screw them and can dismantle the hub, then you can plane the root of the blades at an angle of about 7 deg to reduce the angle at the tip to about 3 deg. You will have to do both sides to keep things parallel.
If you can sort out the prop then it is worth thinking about the alternator but you need to know tsr before you can do much with that.
Flux