Germany hasn't got control of the Med, he can't send ships to attack Japan, and vice versa.
Of course he can send ships to fight Japan—
if the British let him.
Hitler points out the
Scharnhorst, Gneisenau,
Tirpitz,
Schleswig-Holstein, and
Schlesien are all perfectly capable of being valuable contributions in the fight against Japan. All Britain has to do is give up the vindictive war Britain declared in September 1939 to preserve the unjust terms of the Treaty of Versailles, a war it has clearly proven that it cannot win. Germany never wanted war with Britain, and in its magnanimity, Germany wants nothing from the British except an end to war. The British can keep everything they had in the
status quo ante bellum, even the League of Nations Mandates to Germany's old colonies. Additional guarantees to Britain can be negotiated out in the peace talks. Just sign the costless armistice and let the British and German fleets sail together to the Pacific to defend Australia.
The ideal outcome here for the Germans is that Churchill loses power and a new PM accepts the armistice. If that happens, Germany will be able to import necessary resources for the war (oil, tungsten, etc.) while its factories go unbombed, which significantly improves its chances of defeating the USSR in 1942.
The second-best is to empower American isolationists to force FDR to back down on support for the British (and Soviets), make America fight a "Pacific First" war, and cause massive discontent in Australia with Britain.