It would be technically possible to create a plugin that loads one specific component and then assign a shortcut to call it. I don’t really see why though. Shortcuts are limited and the amount of components almost limitless. What makes these 5-6 components different? How do you know you won’t soon have 15-20 equally special components that you also want to import the same way?
Another solution could be to keep the folder the components are saved to open, and simply drag them into SketchUp when needed. You could also make a collection for them and add them from the Component Browser.