[invader@mail.com]

Hello! First let me apologize! This is my first post and if I sound like a newbie, it is because I am :-)
I read many articles on staggered vs square setup on this forum. I am mentally prepared to move to square setup, for own preference reasons. My question is about 2018 740i M Drive setup. I talked to a few tire shops about going with square setup, and everyone discouraged it except discount tires, who suggested I get niche Ritz rims and move to 255 45 R19 tires. I want to continue using my existing rims with square setup.

Looking at Michelin website, it looks like I can go square setup with 245 50R18 and keep the same rims. Has anyone tried it?
My current setup is 245 45R19 in front and 27540R19 in the rear. I got OEM crappy Hankook tires with my car.

Thank you!