If I calculated correctly, the FP for that amount of peanut butter is 36.32, cream cheese 4, sweetener (Splenda or dextrose) 0, heavy cream 5, and vanilla wafers 9.66. I assume butter is 0 since it has no carbs, fiber, or sugar alcohols. The sum total is 54.88 FP. If you cut the pie into 10 pieces, the FP of each slice is 5.488. Remember to purchase peanut butter that does not have sugar or other ingredients added. That will raise the FP.
I could not find the GI for sunflower butter, so could not calculate the FP.