I made a hack where you can recruit Birthright units and Fuga in Conquest. The Birthright units have their Birthright bases, can support the Conquest units that they could in Revelation, join at the same time they would in Birthright and join alongside the Conquest units. They do not replace anyone. You can also forge Birthright weapons thanks to the code ips file, the file needs to be placed in the title id folder right next to the romfs folder.