Thanks to the other thread, I noticed the hole in the charging connector. It seems to be made to fit a standard luggage lock. I happened to have an old one laying around, and it is perfect, as seen in the picture below: Of course, it won't stand up to a real "bad guy" with a bolt cutter, but none of the solutions will. It is a deterrent, and works fine as such! And, no modifications are needed, and it has a combination, so you won't lose the key.
Master Lock - 4680DNKL is what others have recommended...and you can use it on your luggage when you travel.