A German super-battleship in 1928 and the expected Allied response

How would Germany and the other powers react if a 500,000-ton H-45-style battleship appeared under the German flag in 1928?

France would probably invade Germany and the Royal Navy would move to sink the ship because its mere existence would be read as a deliberate treaty violation and strategic threat.

In this counterfactual, France is expected to treat the ship as a flagrant Treaty of Versailles violation and invade before Germany establishes a convincing explanation. The vessel is imagined with nine Schwerer Gustav main guns, twelve 15-inch secondary guns and a speed of 30 knots. The discussion distinguishes 1928 from the later 1930s: the financial crisis and subsequent cuts have yet to weaken the opposing forces. French troops are already in the Rhineland, while the Reichswehr's strength is corrected during the exchange to 100,000 men. The pre-London Treaty Royal Navy is expected to mobilize the Home Fleet against the ship. A propaganda bluff is judged unlikely to gain time before that response. The comparison closes with the first Deutschland-class ship, laid down in February 1929, as the much more limited historical rearmament step.