Like you say, very close, but I think it's on the wrong side.
You are right this would be the same a +32 on a M3P, given the 3mm lip.
However, I am running 275's on +35 wheels on a M3P, and it barely fits. There's a bit of a polish on my upright where the tire just brushes it under some load conditions. A 285 would theoretically add 5mm to each side, so you'd be 2mm worse than a 275 on a M3P. In the end it will come down to your exact tires and how wide they really are.
Most M3P's run an offset of around +25 when running 10.5" wheels, and then run a 285/295 tire. That's equivalent to running a +28 for you, but that's still 7mm off from your +35 fitment. This generally requires some camber as well to not hit the fender at full compression.
Are you looking for such a wide tire and fitment for looks or performance? I'll say it's a bit of an odd choice to trade such an aggressive fitment and the massive range reduction it will cause along with non-performance tires. Most people going this aggressive are in it for actual performance increase, and have the other supporting bits such as running more camber and better shocks. I run 265's on the street which fits great on a +35 wheel and gives all the performance you can really ask for in that environment without any fitment issues and a reasonable trade on range hit.