How can I paint over a poly’d wall?

Seemed like a great idea@the time. I sized the walls then wallpapered the walls of a small powder room with randomly torn pieces of kraft paper, after which I applied a coat of polyethylene to the surface. Now I want to change the walls - I’m afraid I’ll damage the drywall if I pull the paper off. I realize the Kraft paper texture is probably there to stay, but I just want a new look. Any thoughts on sanding the walls, perhaps sealing with Kilz and using latex paint?

q paint over poly d wall
q paint over poly d wall
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