It is never too late especially in a discussion like these that never found a conclusive end.
But as nice as your speculation is, I don't see that with so less an textual evidence as we have, to have Celebrimbor in Gondolin is out of question in our version. That means it is not siad explicit or strongly suggested. If we could handle it textwise, we might leave this question open. But for that I would suggest to work out a text.
Respectfully
Findegil
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