Slice bananas crosswise. In blender or food processor fitted with metal blade, combine half of drink mix, pineapple juice, milk, cream of coconut, and banana slices. Process until pureed; pour puree into 6-cup bowl. Puree remaining half of liquid ingredients and banana slices with eggs and liqueur. Combine both purees. Combine raisins and crushed pineapple with juice; set aside.
Place about two third of bread cubes in crockpot; sprinkle half tsp grated lemon peel and spread 1 c raisin mixture over bread in slow-cooker. Top with remaining bread cubes; then with remaining lemon peel and raisin-pineapple mixture. Pour pureed ingredients into slow-cooker. Cover and cook on low 6 hours.
Spoon pudding into dessert dishes and serve hot. Garnish with mint. If you prefer to serve this dessert cold, spoon into serving dish, cover and refrigerate; then eat later.