That's an interesting question and clearly house ruling the solution is the way to go.
I would suggest that you approach the target and on the appropriate card near it play a stall card to represent the Stuka rolling into the dive.
The next two to three cards I would suggest should be used for the dive bombing - Now as the Stuka can dive very steeply so you can either decide it doesn't move at all, or, you could play two to three short cards (ignoring they are consecutive steeps) to give it a little overground movement dropping the bombs on the second or third card with say one short card to impact.
I would then play a climb card to show the Stuka has pulled out of its dive and if you are of a mind you could say the crew are pulling so much G they cannot fire their weapons on that movement !
To attack the Stuka in the 'dive' element or after the bomb drop then I would suggest that any attacking plane will have to play a dive card to show it has dropped to that level to make the attack.
It's probably more complex than that but this might give you a starting point to play around with.
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