Good suggestion mate!!!!
You just gotta use common sense sometimes.
I had a consevatory to dab and skim a last year ,all the walls could be dabbed except one existing wall which was the boundary wall that had been painted with masonry paint several times over many years it was also only 4 inch wall with 6 foot pilars for rigidity.
Couldnt dab it for obvious reasons,but you can tell from the way the paint looks on the surface if it will take board adhesive 9/10 times.
At the end of the day look at it like this...the heavy board is only held onto the wall by a 0.5 mm thick piece of paper sandwiched between gypsum mineral and adhesieve !!!!!
i ve steamed wall paper of houses 120 years old and cant get the paint off!!!
Put some steam or water onto the paper holding the board onto the wall and see what happens??????
youe paniking about nothing just dabb