The blueprint uses Slot 26, if you have an existing blueprint using this slot you will need to move the blueprint .json file to different folder.

Batch files to disable and enable un-scrapable objects. Either manually copy to your Fallout 4 game folder, or install using vortex using ‘engine injector’ as the mod type. To use in game open the console and type 'bat FFV-26-Cleanup'.

This makes a single edit to the cell the Bar and Stores on the main pier are located to be part of the settlement. Without it settlers can still be assigned there but will not trade with the player (not needed to import the settlement).