I didn’t expect this to be as tedious to workaround. Although I neither expect there to be a workaround, to be fair. Thank you for pointing me in the right direction.
Just for the record, my concern is not specifically about the slider, that was just an example. What I’m looking for is for a simple way to show a blank page with just the WP-Member login form when someone tries to access any blocked page.
Are there any plans to implement such feature in a future update?
Thank you for your quick and clear response.