A module will be built. It can be fitted to any ship that can take modules.
A script can be loaded into the module.
On loading the script the ship that is running the module now looks like a different kind of ship when someone is viewing the D-scan information or using scanning drones for the local system.
A Rokh could be registered as a Retriever.
An Avatar could be registered as a Kestrel.
A Procurer could be registered as a Naglfar.
Up close the ruse is exposed, obviously.
The cost of the script will be different for the kind of ship one wants to disguise as.
The risk is giving up a vital slot in the offensive / defensive load out of the ship.
The reward is adaptive fleet tactics.