I personally wouldnt go for something like having the ring on the shoelace in the end because the strength of such an ending is that you never went anywhere near the shoelace. By stepping on the ring and bending down to pick it up, you lose a majority of the effect.
If i were you i would probably go with something like Gaetan Bloom's ring flite because it allows you to put pocket the case in someone else's pocket, and have the ring appear there. Allows you to talk about how you would never really damage their ring and you actually put it somehwere "safe and sound" all along; in their own pocket, inside a key case.
Using Blooms' would also allow you to switch in the broken pieces.
Just my 2 cents.
Cheers,
Lucas