It is a long shot. All sovereigns have reserve powers — they can refuse assent but convention tells them no tot. But the previous king abdicated rather than sign the abortion law. The reserve powers have been used in the Commonwealth nations in my lifetime (Australia: the governer-general dissolved parliametnt unilaterally — that is not on the instruction of the PM). They are real. He can use them.
The same thing is built into the US constitution: you elect your king and call him a president, and he has the right to veto legislation.
The EU may then over rule him, but I think that organization is less righteous than a Borgia Pope.
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