Inspection required

We have 105 materials that we buy from a single vendor. Of those,
3 need inspected when they come in. You apparently cannot mark
parts "inspection required". Only vendors or part classes.
Obviously we wouldn't want the vendor marked as such. If we
were to use classes we would have to double up on loads of
classes like part class "flat steel" would now need a "flat
steel INSPECT". Is this the only way to do this?