If you like it spicy, add an extra 1/4 cup of hot sauce to the chicken. It won’t change the consistency dramatically.
If you'd like to reduce the size of the recipe for a smaller trifle dish or bowl, go for it. Just halve all ingredients except celery (to be sure you have enough to go around the outside of the bowl).
Crumble your own blue cheese from a large wedge. You can make bigger chunks that look prettier in the trifle dish than the precrumbled kind do. This also allows you to use nicer varieties of blue cheese, if desired.