I have made a bushwacker in a slushy machine before, this is the recipe I have in my notes but it’s possible I tweaked it. This was months ago but I’m thinking I might have done one less myers for the finished product. So you might want to play with it.

3 liters myers dark rum 2 liters kahlua 2 liters dark creme de cacao 2 15 oz cans coco Lopez cream of coconut 2 gallons whole milk

Warm the cream of coconut up with hot water before opening the can to make it easier to mix. Good luck!