folks who have done games with non-flat planets:
it it annoying doing physics, collision, alignment etc. if you use world coordinates rather than some sort of more gridwise local system with actually flat ground?
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Fun fact: One of the prototypes for XCOM: The Bureau let you fly and dogfight around the entire earth. IIRC I ended up using quaternions a lot, eg 1 quaternion + a height float to represent position.
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Do you remember how you represented heading along the surface of the sphere? That's something that's tripped me up with quaternion+height representations in the past :(
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I think I've now been thinking that instead of a bearing angle, you need a vector that represents the plane of the great circle that your entity is travelling along.