Look at it like this you got half a house to do. One ceiling is deep artex . Quickly chuck some pva on . Start other room . Most of time you will have a hand board worth of plaster left . That bit of plaster will pack that artex out a fair bit . You don’t cover it just fill the pattern. . So by time you get to it ,it’s flat n prob pva,d again in say 10 mins work . Better then scraping it down and eating that asbestos