I was thinking Air Canada as it has Airbus fleet but there are no guarantees and would result in a major move depending on where one ends up being based and whether would even be selected on Airbus or Boeing as company decides what fleets need filling from my understanding.
I live in Central Canada so Westjet could be another option but its Boeing aircraft.
I won't get into the Airbus v. Boeing debate, but I will point out that it doesn't matter as you're assuming you have a choice.
While Air Canada has an Airbus fleet, you don't get to decide what you'll fly when first hired. At least, not right away. Your initial position at Air Canada is based on the needs of the airline, the positions being trained at the time your class goes through (availability of instructors and simulators per type), and what you draw for seniority in your class. Some classes are a mix of available types, while others are all put on a single type. In one case a good friend was offered right seat 767 or relief 777. Her class had available positions on the 767, 777, and A330. She drew the middle of her class for seniority, so she still had her pick. Another friend two classes later was told everyone was going on the A220, even though the airline had multiple open spots on other types. A third guy I know, his class was a mix of A320 and 737Max. He found himself on the Max because he drew last in seniority and that's all that was left. You simply don't know when you start, so you have to be prepared for anything. Sure, once you've done your initial you can bid for whatever your seniority can hold, but at that point, you've already done the training, so you should be bidding for lifestyle. Also, I've been told by friends quite recently that if you have previous jet experience, you can expect to be shoehorned onto a heavy into the right seat (cargo) or cruise relief, so again less choice, and maybe not what you want. As for upgrades. although the time at AC seems to be 3-5 years right now, I'll point out that many new hires in the last 5 years are all still in their 20s or early 30s. In 5 to 10 years, Air Canada will start to have a movement problem as those pilots upgrade but are still 25-30 years away from retirement. I firmly believe the next 15-year FO is already on the property at Air Canada, so I think your idea of ending in the right seat is probably very realistic.
As for WestJet, yes it'll be 737, and likely Calgary-based, but they've had moments too where they only hire for Toronto. But, they've recently opened a Winnipeg and Edmonton base, so depending on where you mean by "central Canada," you might be able to avoid a nasty commute. They do not allow new hires to fly the 787 because they use a transition training program from the 737, not an initial, so at least there is certainty there, although that's where it ends. WestJet is just starting to merge with Sunwing, and the lord only knows what the implications will be from that seniority and base shakeout. Upgrade times are a low of 9 years right now, but there simply is not enough movement compared to Air Canada. Many guys and gals wait 12-15 years so they don't have to hold reserve, and of those upgrading, many are in their early to mid-40s, so same deal - in 10 years it'll be a slow trickle, so planning to end in the right seat is again, pretty realistic.
But ultimately, I don't think you'll have a problem with the actual airplane. Sure the systems are different and the way to fly them is different, but the training program is meant to teach you how to fly that airplane. By the time you hit line indoctrination, you'll be drawing on your previous experience rather than falling back on it. A year after that, you'll complain to the guy you're flying with about the things that an Airbus does that Boeing doesn't and vice versa, but it won't hinder your work. At least, that was my experience watching students change types.