I'm afraid your idea isn't feasible. BKB designed new campaign map building pieces for indian and eskimo factions but he attached these settlements to these factions using a simple method. In the Build.txt file of Age of Warlords these buildings are defined in the same column that the original MTW fortifications, but "indian settlements" are only available to the mentioned factions and MTW fortifications to European factions. In fact BKB used the same principle that works with the Gunsmith line of buildings: the Egyptians can build the first level of gunsmith (and train mamluk handgunners) while the rest of the factions begin in the second level, the gunsmith workshop.