/cgl/ - Cosplay & EGL

I'm looking to find a method of adhering a metal, clip-on fake navel piercing to my body? I'm cosplaying Jolyne Kujo, who has one, and I have a couple of little fake clip-ons with star charms like hers, but they don't stick on well enough? I know I'd lose them at cons within minutes.
The only ideas I have are eyelash glue and spirit gum, but I have no experience with the latter, and I get the feeling that neither would work well sticking metal to skin, especially on such a small surface area?
thanks in advance for any advice