AC should focus on creating a Signature Suite instead for YUL.
Unless it's a space issue I don't understand why Vancouver has one and not YUL, when YUL has just as many ( and perhaps more on certain days) overseas flights.
The YUL international MLL is decent but can get very busy ( although the last time I flew I was the only one there).
AC has done a great job with the Signature Suite but in the future should look at what DL has done in JFK with their new Delta One lounge.