Will we be able to fit interdiction devices to other ships?

In the future, yes, though quantum enforcement devices (QED) are not currently equippable by other player-flyable ships. When available, QEDs will be equipped via the utility item ports. However, they won't be as powerful as the units built into ships such as the Mantis and may require compromises to loadout. They will also be used by various AI ships and security forces to interrupt player quantum travel.