No, the script part is definitely there. I have no idea why. Maybe to sound fancy and official - we still have a lot of Latin present in mottos of fancy official places - but why be so official in such quantities with your own kin and kind? Especially since this bunch was very, hmm, nationalistic. All I can say is that I've tried reading a language written with the wrong script, with various combinations of languages and scripts. Trust me, it is not an experience you'd want to do repeatedly. It's a pain in the neck trying to decipher simple words. So if Ori wrote in Kuzdul using Elvish characters, just
why would he make life so difficult for his readers?
Edit: xed with
Form. Hey! Good to see you around!