I understand your concern about this issue, as these materials are not easy to handle and they carry a significant risk. Here are the requested details:
1. The items will be shipped in specially remodelled and outfitted gunboat class vessels, with gunboat and snubcraft escort. BAF/BPA/BIS escort is welcomed and can be arranged any time, if you want to be more sure about security. The crew is specially trained and has special orders, outlined in point 2.
2. The shipping containers are air-tight, shielded and insulated. The special cargobay is unpressurized, and outfitted with shaped charges, which will be armed and blown up if any sign of contamination or leakage is detected, destroying the cargo itself, but leaving the ship in operational sate. The ship will be thoroughly inspected and decontaminated before repairs (or destroyed if necessary). The ship itself will have minimal crew, and the computer systems will not be networked in any way. The crew will wear pressurised exosuits throughout the entire voyage. In case the explosive failsafe is ineffective, the crew will leave the ship, and the ship will be set on a collision course with the nearest star via a remote system. If this fails, the ship will be destroyed by the escort on the spot. The remains will be collected and disposed into a star.
If you think these failsafes are not enough, please direct me to the proper Bretonian agency for further advise.
3. This kind of shipment would happen on one or two occassions altogether, though the exact time is not known yet, we are still making arrangements, and the special ship is still under preparation. I plan to contact the relevant Bretonian agencies to carry out the shipping with their support, as I believe their knowledge on this matter would greatly lower the risks. I'd be glad if you could provide me some contact details in your answer, or on a private channel.
If you have any more questions, please don't hesitate to contact me.