I'm flattered, and glad the idea is useful.
I would add the express spaceports are uncommon, and restricted to authorized ships.
Here's an example of how they might be used:
Worlds "A" and "B" are jump-7 apart, and have huge passenger traffic between them.
Top-paying passengers board a shuttle on A to the express spaceport, and board luxurious staterooms in a module with 100 staterooms, 100 dtons of high passenger space, a dedicated power plant for life support, and little else. There they await a Jump-4 module carrier, and when it arrives in system, a high-G tug transports the module to the carrier, other tugs pull priority cargo, and high-G fuel tankers refuel the carrier. The carrier is over-staffed in engineering so it can do its every-jump routine maintenance rapidly. It jumps out to an in-between world in less than a day.
The modules from the Jump-4 carrier are unhooked while high-G tugs haul modules from the express spaceport, returning with the modules from the carrier. It's checked up, refueled, and hooked up with more modules.
The modules from A wait there until a Jump-3 module carrier arrives, and the process continues. Arriving at B, the modules are unhooked, and tugs haul them to the express spaceport, where they're transferred to shuttles, which take them to the starport.