So, exactly the same as the OP, only with the need for a special FSD and no requirement restricting it to already visited systems.
This was actually the core idea.
- Your first trip to Colonia or the other side of the Galaxy should not be impacted.
- Restricting it to system you had fully scanned meant that you invested some time on the journey along the way, not just waltz through each system. The reward was a faster trip back home.
- Having this take an internal slot meant that their was some trade off to using it and you probably wont want to do it for a bubble fighter or miner.