Zipline (Spline) between 2 Actors spawned by one Blueprint?

Hello there,
atm i´m working on a Zipline! I created a Spline Blueprint (it contains only a Spline), and a function in the First Person Character Blueprint, which moves the Player along the Spline. Works fine. Now i want to have a starting point and the end. Of course i could add Actors/Meshes to the World and then place the Spline manually. But in larger worlds, that´s to much effort.

How can i spawn 2 Actors with 1 Blueprint, where each Actor can be moved (in the Editor, not ingame) and create a Spline between them? Actually, i want to recreate, what you can see here.