New answers tagged manipulation
You could put a sturdy (Technic?) structure inside the fuselage that provides the wing connectors with the required angles.
Using a cut-pipe into a clip-with-tube will let you build a secure and precise angle. If you have a solid brick behind the headlight bricks you can fix the angle by cutting the pipe at the right length.
I'm not sure how sturdy your design needs to be, but using bar and clip parts could do what you want. There aren't any fixed angles when using those, so you have complete freedom, but a less rigid connection. If strength is an issue, you could try using multiple clips or the double wide variety:
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