Whatever you do make sure you are training for your JAA certificates. A Canadian pilots certificate will not get you a job in Europe and there are plenty of Canadian pilots waiting for an upgrade so you likely won't get a work visa to fly in Canada if you get a Canadian certificate. Going to flight school isn't going to university, so yeah they'll take you with any marks. In Canada and the US there are plenty of schools that offer JAA training catering to Europeans since the cost of flying is much less in North America. Aer Lingus gives preference to Airbus rated pilots with 500 hours in Airbus aircraft, but Ryan Air which would presumably have lowering hiring times (and thus a steppign stone to Aer Lingus) flies B737's. Aer Arann doesn't list flight hours preferences so the whole thing is a mystery.
My advice, if you want to fly for a living get your JAA certificates up to frozen ATPL. Since if you learn to fly JAA in Canada, you won't be able to fly for a living in Canada expect to fly for a much smaller airline in the UK for a while to build time.
Keep applying to the programs the larger airlines around there have that take untrained or inexperienced pilots and train them for future jobs with those airlines.
Learning to fly commercially in Europe is crazy. Best of luck.
Train and get the credentials for student, private, commercial, instrument, multiengine, and instructor pilot. Get an education loan from a bank if necessary. Do some entry level flying jobs for a while, and then progress to airline flying.
I'm a pilot and once considered an airline career in the 60's, but I decided to do freight and charters instead.. Check out an approved flight school that offers all the ratings up to an ATP (Airline Transport Pilot) figure on about $40,000 to complete this in 4 years, there are accelerated flight schools here in the US that boast certification in about 18 months, but you will need turbine time to qualify for any right seat position....Hope this helps you mate, good luck