Just a heads up...you want to be quite careful when using Cu with cyanide.....under some conditions the disproportionation of Cu(I) can lead to cyanogen evolution. Sadly only about 1/2 of people can smell cyanogen...I know I can because it smells like almonds, I also know my other co-workers could not....so the danger is quite real, and quite significant.
The quick answer to your question...definitely metal specific....this makes sense if you think about forming stable solid state structures...the size, shape, softness/hardness of the metal ions determines the dominant cyano complexes being formed.
With a little bit of work you could probably develop a matrix of precipitating agents...which would probably have to be applied in a specific order.
Having a silver bullet, nope that is definitely not going to work.
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