What about the Majapahit discovering the Aztecs while trading with Satsuma and Ryukyu, due to one of the ships that drifted to America while trading with Japan and Okinawa returned to Java..
What would be the Use of knowing the land, I think Majapahit might import corn and potatoes and Luzon would be a very important province to Majapahit..due to the trade they started..I think the Ming or Yuan might hijack this..