Removing tiles from paramount plasterboard wall

I’m currently looking into retiling my bathroom but i’ve got an issue in that the current non-plastered paramount (egg-box) plasterboard wall has got two layers of tiles on it. Obviously if i damage the wall in the removal of the tiles it’ll be a lot of work to fix.

As such i was wondering what would be the best way to remove the tiles/adhesive. I’m going to be buying a Bosch GOP 250 Multi Cutter so not sure if that could help with any of it. I’ve also got a steamer if that would help…

Removing tiles from paramount plasterboard wall