Not sure why you can't have applesauce, but this little amount spread across 20 servings wouldn't give you that much applesauce per serving. You would probably be okay.
I think this would be too much oil if you used all of it. I think it would be about 8 grams per brownie if you used 20 servings.
Can you have peach sauce or mango sauce? I have a recipe that uses baby food pureed peas to replace the fat. The brownies turn out really good to (even though it sounds gross!). Maybe you could use that.