[X] Let them have all of it - Sole shall do nothing with it, ensuring his security while letting Isard retain her advantages. This has no risk, and would keep his cover, but does nothing to curtail the information held by the Empire. *Status quo.*
[X] Let them keep the data on known systems - Sole shall delete the information on the Unknown Regions but let the Empire have everything else. Until Isard sends an expedition to them, she will never know what you have managed. *Isard loses access to maps of the Unknown Regions. If she tries to make use of them, it will be a disaster and Sole will need to escape.*