That huge amount of fork offset is there to compensate for the very slack head tube angle.

Short answer. The builder knows what he is doing. It all comes out in the wash. It may look weird but don't change forks without understanding the geometry.

I'm not expert enough to teach you either but I know enough to say that it actually looks right to my eye.

The number that is REALLY important is, "trail".

Bicycle Steering Geometry

EDIT: having read your question again. I don't recommend you change the fork. The head tube angle, NEEDS that amount of fork rake. Don't change anything without understanding it back to front.