Know this thread is old, but the most obscure I've encountered was a bata style that's somewhat similar to Jogo do Pau, Cleith Fada (Long-Wattle; a 4-5 foot stick), that is apparently still practiced by some stick-fighters around Cashel in Ireland. It has a two-handed form similar to Jogo do Pau, but there's also a style that apparently imitates old hand-and-a-half sword movements with a rectangular or round shield made from wood or wicker. I've been helping work on a book on bata though since I was 18, with my father, and he wanted help finding more styles.