Many Cajun seasonings are quite salty and replace salt & pepper in recipes such as this one (I used Tony Chachere’s Original Creole Seasoning). Be sure to give it a taste before adding extra salt. And be sure to use low-sodium chicken broth if you’re sensitive to salt. There are low/no salt Cajun seasonings available if needed.
If the pasta is soaking up the liquid too fast (like before the orzo is cooked), turn the heat down and/or add a splash more broth or cream. If there’s too much liquid, cover the pot for longer than suggested in the recipe and the orzo will absorb it quickly.