This is an easy dessert to make, but not low calorie.
Cut the pie when it is partially defrosted, as it is easier to do. Pie should be totally defrosted when trifle is served.
https://www.tasteofhome.com/recipes/easy-key-lime-pie-trifle/
The Peach Caprese salad that showed up on that same page looks very good, too:
https://www.tasteofhome.com/recipes/peach-caprese-salad/