Yes, very true. I think the main difference that I would imagine would be psychological. The sensation of having something external vibrating against your skin, as with a magnet superglued to a finger, is different than the sensations being internalized.

When my magnet responds to something, it feels like I am responding to something. I don't feel a sense of separation from the magnet.

That being said, supergluing a magnet to a finger is probably the closest one can get without getting the actual procedure. Which obviously isn't for everyone, heh.