I've heard claims that not all Apple screens are created equally, especially around the iPad3 time, some of them having different amounts of PWM than other batches (only plagued older models 2012-2013), maybe dithering depending on screen type, etc. My 2015 Macbook Pro has a Samsung screen I believe, maybe find a friend who owns one/find a way to test one in a safe environment.
If all else fails go the small CCFL monitor route/refurbished 2009-2010 laptop.