I say yes, wear the small shaped crosses. Why? Because I know what will happen. People notice and say, I like your earrings and when they do, they are saying, I agree, I too look up to Christ.
That is the reaction I get when I where my Miraculous medal. When I say my Rosary (to myself while walking the path at the rec. center) I get very few who agree and in fact I get more who disagree and start a conversation.
Today we need that, my opinion.
The early Christians who were in hiding might draw a fish sign in the dirt with a stick to another person standing next to them.
We get too much garbage in the world such as skulls and ugly faces on internet to shirts, stickers on cars and tatoos.
What you suggest is so subtle. So, for the good and be ready for smiles and conversation.