Good stuff, looks like your OE nuts will work.
As for caliper clearance, highly unlikely that the diameter will cause an issue as just about any 18" wheel will clear. It's what we refer to as X-factor, that is the horizontal protrusion of the caliper towards the spoke area of the wheel, that you have to watch for.
See #6 in the diagram below.
Again, the X-factor numbers on the 3 are pretty reasonable, but some steel wheels can lack a bit of clearance in that area so essential to test and make sure you have at least 2 - 3 mm of free space at the closest point.
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