Yeah, that's exactly what I mean. I was thinking of the issue as sprites being too small to accurately touch on a touch screen device. If you want to increase the interactive area of a sprite but it's going to be colliding with other spites (a touchable game object, rather than a button) there are two ways to do that I can think of. The first is what you mentioned in your OP, adding a touchable object to the sprite that sets it's position to that sprite (Also, keep it in a container to help with picking and spawning). The other is to increase the bounding box size and use multiple image points and overlapping at offset to determine your collisions and set your events.
If I'm still not understanding please let me know. Also, if this isn't helpful I might need a bit more info on what the purpose of the sprite is to think of a solution.