I suggest you venture out into the vanilla world. The thing that makes a bracelet locking is a lock, so really you just need something the right size and a good little lock. If you don't want to walk up to someone and tell them what you want engraved, you might be able to abuse one of those dog tag making machines that they have at the pet store.
I can't really give you fashion advice as that's personal. I wish you the best of luck.
If it involves gear I can answer it. Whether you're talking basic sex toys, restraints(leather, steel, etc....), electrosex, fucking machines, butt plugs, or any other kinky practice that involves gear. I can answer it.
Experience
I'm here representing www.eXtremeRestraints.com, we're one of the biggest bondage gear and fetish supply retailers on the internet. We spend a lot of effort looking for the right products to carry in our store, so we should be able to answer any questions. In short, we have a big warehouse full of just about any equipment you might want to ask about.