Hm there is also always the option of rhodium plating the bangle. I did this once with a very pretty gold plated one. The plating came off and I just sent it in to be replated with 18 kt and it came back looking brand new for just a few bucks. Any jeweler can do this. But of course you have to be sure if you want to do this because then this bracelet will likely cost about 400 - 500 $. I don´t know if this is worth it.I think a platinum one would look lovely.
Its a shame I'm not a yellow gold wearer or I'd pick one of these up in an instant.
As an another option you could custom design your own "love bracelet" and see what this would cost to do at your local jeweler. Sometimes this isn´t overly expensive - you could choose silver as a main material instead of gold and then have it rhodium plated so it looks like white gold - it would be the perfect size because it´s custom made if, like you said, you have tiny wrists.
Maybe this is an option to think about? How much would be your budget if I might ask?