You abslolutelly can use cocaine orally, however I never did so can't tell about duration&nature of effects, differences with other ROAs, etc..
But you can find information in internet, maybe even recipes and proportions, about Mariani Wine - or elixir Mariani-; it was relativelly famous back in the second halve of XIX Century in Europe.. The drink was widely used, but its ultimate marketing campaing came from the fact that His Holliness Pius X and His Holliness Leo XIII enjoyed it and drank it on a regular basis. There are still pictures in internet of old Mariani's propaganda with the Popes on it
I mean, If drinking coke worked for supreme catholic leaders, it should work for you too....