You will have no lounge access on arrival.
*A lounges are departure lounges only, unless specifically stated as an arrivals facility.
So, arriving on LX with no onward BP means no access.
As to departure, if you looked at the AC website you'd see that Air Canada uses the Aegean Club CIP lounge on the first floor in T1.
As a *G in a contract lounge (in your case here) you can bring one guest - if he/she is on the same flight. So afraid you're out of luck.