Adding a button, or making a building spit out a vortex would require quite a bit of hacking knowledge. It might be slightly doable, say having a building you can click on, and tell it to launch a vortex by clicking a button in the command pane. But nobody here currently knows how to do it. (Although, I've seen code to suggest this could be done without an exe mod. But it would require LOTS of mem hacking.)
In other news.... I think I've figured out how to control the direction of movement for a vortex. (As opposed to a cheap hack to get it to move sorta where I wanted it).