I travel internationally with roll-ons in a plastic bag in my shaving kit. I have never had one leak. When I open the plastic bag - no smell from the roll-ons. I have had a lot of leakage from sprayers, smelling up my whole shave kit, so I quit using them. I think my luggage in a cargo hold of a 777 probably experiences as much hot/cold and pressure changes as would yours in shipping. I believe you can ship the roll-ons with high confidence!
All the Best - TricsMan