I do remember having these issues when my girls were toddlers. My girls did not like regular applesauce, but they did like baby food fruits, like Gerber peaches or whatever. We used babyfood for what seemed like forever. The texture is so different than that of regular applesauce, and it's not sweetened.
We have been known to use mashed potatoes (when cooled down), whip cream (Yummmm), whatever it takes. I think we even used guacomolie (spell?) once in a Mexican rest. when Kayla was little.
Yes, applesauce is ideal, but our CF doctor said that if it's not sitting there very long, then other foods are ok. With Kayla having problems with hers in the past few months, our CF doctor has even had me mixing them with Nerds candy. Sometimes you just get desperate.
Good luck!