We do have the Imperial Courier but what about a REAL courier?
-EXTREME jump range
-Small fuel tank (It's not an endurance runner but designed to go from A-B with messages)
-Limited Internals
Let's go with the basis of an Imperial Courier designed for RANGE
-Increase Frameshift to 5
-Remove the two S3 internals
-Change hardpoints to X4 Small
-Reduce powerplant to S3
-Reduce thrusters to S2
-Reduce fuel tank to S2
Base speed becomes 286 with a 2A thruster and jump range would be a lot.
Just wait for military drives.