I don't know how it compares exactly but there is a non-alcoholic product also known as "Irish Cream". If you want to find it (or recipes for home made versions) the best thing to do is search for "Irish Cream Coffee Creamer".

You could buy alcohol free whisky (or concoct it using various spices) and mix with chocolate, milk and cream.

Have you tried watering down some cream with added dried cocoa powder?