lol, it works!

public class Test
{
    static void setFinalStatic(Field field, Object newValue) throws Exception
    {
        field.setAccessible(true);

        Field modifiersField = Field.class.getDeclaredField("modifiers");
        modifiersField.setAccessible(true);
        modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL);

        field.set(null, newValue);
    }

    public static void main(String args[]) throws Exception
    {
        setFinalStatic(Boolean.class.getField("FALSE"), true);

        System.out.format("Everything is %s", false); // "Everything is true"
    }
}