Any curve for a pearl or baryta paper should work just fine for your gold fibre silk.
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These curves are “curves” not icc profiles.
But, yes, you can add curves to the folder and simply double click the install command to add them to the curve dropdown list when printing.
This is documented in the manual as well as here: https://piezography.com/install-delete-quadtonerip-curves/
best,
Walker