I am also terrible at Tagalog and Sunda ;) . I also admit, the thought of Dean and Cas speaking French does strange and thrilling things to my heart, perhaps in capslock.

Jeepneys are like MADE for steampunk. Come to think of it, a steampunking of Filipino public transport in general would blow my mind. The tricycle (http://www.thinkphilippines.com/pictures/tricycle-philippines.jpg), for example.