Let me know how that goes, I just picked up a Matrice 210 with a FLIR XT2. I am still waiting for it to arrive but am planning to try Orthomosaic with the images as well. Hopefully we can find a solution.
Good question I’ve been wondering the same thing. Have you tried Pix4d capture? Or Litchi? I don’t have my XT yet but will soon and would like to produce Orthomosaics if possible.