That bread thing is a good idea. I've never tried it, but my mother (who buys every "nifty gadget" she ever sees) gave me a handful of these oval things that can be used as part of a cable lock system or snapped over the strap button the same as that. Turns out they work really well.Schallers on the good guitars.
And these on the not so good guitars....
Schallers on the good guitars.
And these on the not so good guitars....