I tried it, could recruit troops as Pythium and my home was defended by Alae L. and Triarius. I changed them to be from Pythian, nor Ermorian, legions but that shouldn't have broken anything. I haven't tested if the numbers of defmult1/2 actually work.
Besides, I have a bunch of mods in which the national troops have already been put in by hand... So if you want to mod PD, you can mod it through my Nation Replacement mods.
