As I have had no status on CP, I can not answer that part of your question. My Aeroplan Elite card is all I need. However, on my last trip there in late June, I visited a BD lounge in LHR and LH lounges in HAJ and MUC. All had signs saying words to the effect of "We are pleased to welcome Canadian Plus as a new parter of BD/LH".

The LH lounge in BRU did not have such a sign, and I did not enquire.

Good Luck, and Bon Voyage.