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What would one call such a coin? PL-C perhaps?
I think the convention is to still apply the numerical system, so you end up with e.g., PL-50, PL-40, etc. Or perhaps you could call them "impaired-PL".
This is assuming you could still see the difference from a regular circulation coin - certain dates were only issued in sets.
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I've often wondered what they used to do with "PL" coins that didn't make the cut
Or unsold cello-wrapped sets at the end of the year? It would be quite a job to cut up 10000 sets.