Can confirm that Evo OZ / Enkei wheels do fit very nicely with a slight guard roll on the rear, especially if lowered. Bore is the same, Evo 5 (silver) wheels require square shouldered wheel nuts and washers.Interesting. They may have been machined to fit. I've heard of people on here doing that for Lexus wheels. I've seen a few Proteges online with the STI BBS wheels so people must be willing to go through the hassle. If it were me, I'd go the Mitsubishi route, as the Evo Enkei wheels I believe do have the same bore and do come in some good sizes for the Protege.
Both photos at stock ride height, 17" versions of both wheels