Charlie knew that Emmett had extraordinary influence in Eastcliff. With him involved, Vera's proposal was bound to succeed. Furthermore, the feasibility of Vera's method was very high. As long as the authorities endorsed it and showed enough concern for the Ackers, their safety in Oskia wouldn't be a problem anymore.
Even if Fleur was extremely bold and courageous, she wouldn't dare to openly oppose a country unless she was really tired of living, having lived for four hundred years.
However