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> Before getting too deep into it, have you play with the "extract region" 
> command on the Face Mode context menu?  It duplicates a set of faces or 
> polys. Then you can extrude from these new polys and get an object with a 
> face that duplicates your original.
>
>  (As you know the Winged-edge paradigm requires that there be no free 
> edges.  Therefore this tool puts a sort of latent face across the back of 
> the copied faces to seal their edges.  Just something to watch for when 
> using it. )

I did try that extract tool, but it seems to create an entirely new object, 
totally disconnected from the former one, and I can't reconnect it in the 
right place afterwards.
In other words, extracting the faces is what I need to keep similarity 
between the button gaps, but I can't make the extracted portions to be parts 
of the object. The soft just doesn't want to connect the extracted faces' 
vertices to the object's or to newly created of the object.

I understand by your last sentence that a single face extracted from an 
object is in fact a two-sided face, or more properly two superposed faces 
with opposite normals. Does that mess with what I'm triyng ?

Thanks for your interest, but I'm afraid I'll need more help :-(

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