• He builds a refugee camp exactly at the unprotected Austrian-Hungarian border.
• He brings all the refugees, who come to Hungary, to this camp and registers them (thus fulfilling EU law / Dublin regulation).
• The camp has no fence, so refugees who want to (currently nearly all of them) simply walk out to Austria.
• Refugee-enthusiastic Austrians and Germans take them in / let them travel to Germany.

Outcome:

• No refugees in Hungary while breaking no rules (Win for Orbán!)
• Refugees make it to Austria/Germany (Win for the refugees!)
• Germany gets more refugees (Win for Germans!)