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Thanks for all the input. Re: the fingernail decorations - you just glue them on with superglue? I have thought about cutting plastic rod and glueing it on as an option.
For making small circles I have various leather punches. They can get quite small.
Spread a thin coat of greenstuff on the coat, then find a very, very small diameter tube - like a syringe or plastic cover on electric wire. Press tube into the greenstuff and voila! a button!