The driver I originally had was from a pilot figure, so his arms were down in his lap. I played around with TinkerCad and got him to raise his arms. They aren't perfect, you can see were the arm was "cut" and repositioned, but they work for me.
From the left
The original figure with a modern full helmet based on the Stearman pilot
The 2nd on has his arms raised at the elbows. You can see the seam at his elbow
ModernDrv-Open-Elbow.stl
The 3rd on has his arms raised at the shoulders, hands are slightly further apart
ModernDrv-Open-Arms.stl
The 4nd on has his arms raised at the elbows and I added a steering wheel
ModernDrv-Open-Steering.stl
Uploaded
Tom

From the left
The original figure with a modern full helmet based on the Stearman pilot
The 2nd on has his arms raised at the elbows. You can see the seam at his elbow
ModernDrv-Open-Elbow.stl
The 3rd on has his arms raised at the shoulders, hands are slightly further apart
ModernDrv-Open-Arms.stl
The 4nd on has his arms raised at the elbows and I added a steering wheel
ModernDrv-Open-Steering.stl
Uploaded
Tom
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