Re: Clay as pocket token?
I work a little bit with clay.
I use paper clay and Sculpey. I think there is Fimo and Sculpey mainly where I live. I think that the paper clay would be too delicate. It's not delicate, per se but for what you want to do it might not work.
The Sculpey is pretty tough from what I've seen.
I think your coins would work.
It's not that difficult to use.
You can use your home oven. ( depending on where you live etc. roommates, having an oven available )
I'm thinking as I might do a little more with Sculpey, in just investing in a dedicated baking dish. It will be something from the second hand store, glass I think is what is recommended.
By porcelain do you mean La Doll or Premier? Those seem expensive to me.
I think they are pretty durable, I've done flower petals for mixed media type 3D art with that and Paperclay.
Premier and LaDoll it seems dry while I'm working with it. So you have to work fast😮
Sculpey stays soft forever. I have some that is almost 20 years old and it's still useable.