Been off-line for a while, so sorry about the late response.
Jose Penteado Vignoli and I have been in touch since the early 1980's when he had a 1952 Aero Eagle with the 1955 grille. He never figured out how the American Aero came to be in Brazil, but assumed it came with an executive at Willys do Brasil. Unfortunately, that car was totaled in a collision. He went on the own several Brazilian Aeros of later vintage, including an Executivo limousine, which is for sale if anyone is interested. There is a thread about this car on the Willys Aero Survival & Preservation page in Facebook. You may have to go back a while to find it.
Jose is the author of this book and another about the Brazilian Aeros. Worth finding and owning, especially if you speak Portuguese. He lives in Sao Paulo, where the Aeros were built. The Aero was Brazil's first wholly built car, not a car assembled there from shipped in parts.
And Ford bought Willys do Brasil in 1967 and continued the line until 1972 when it introduced the Maverick. The F-head six continued on as the power source for the Maverick and Rural Jeep wagons for three more years. Brazilian Aeros had a longer run and greater production numbers than it's predecessor in Toledo.