A powerful Swedish battleship need not provoke a German attack

Would a Swedish battleship armed with nine 381 mm guns be an unacceptable threat to Germany?

It would be a real threat, but Germany could prefer to avoid adding Sweden to its wartime problems rather than attack merely because the ship existed.

The scenario gives Sweden a fictional battleship with nine 381 mm guns before the Second World War. Such a ship would threaten German surface forces. Sweden already possessed other military capabilities that Germany had reason to respect. Starting another conflict to remove this threat would add to Germany's wartime problems, so the battleship's existence would not automatically provoke an attack.