So I literally tried to do the two screwdriver technique, and that sodding pulley isn't budging. Like, I put my full weight behind it, and it didn't even move a centimetre. (thankfully the axle still rotates, as I'm easily the same weight as a heavyweight robot lul) So, I'm back to square one on it, meaning that I either do the vice technique like I do with the mounts, OR I end up buying a pulley remover and having it be way too big or too small haha.

I think I may go to Screwfix tomorrow and see if they have anything that could help me out.