Thanks for asking. Let me try to clarify to make sure we're on the same page.
The airline could give you grief if you tell them you are a PR and then don't have a PR card because they have no way of verifying status. So, it's best to just show your passport and not give any details on PR and COPR (unless they ask). If they do ask questions - and I've never had an airline ask that type of detail - but if they do you can explain that they will not be taking any incremental risk because even if you were not a PR and we lying to them about that then you could go in as a tourist. Bottom line - no chance they they will get fined for not checking that you can legally enter.
In contrast, immigration should be fine with it at the airport since they understand COPRs and can verify status. I have seen it done at land borders and have read of many people doing it at airports without a glitch so I wouldn't be worried (even though I haven't done it or see it done personally). The worst I've seen at land borders is them teasing you about celebrating your new status by leaving
I hope this is clearer ... but please keep asking until it is