I contacted the folks in Ontario about my UK motorcycle licence as well...they said if you've been riding for 2 years or more you should be able to get credit for that and just sit the test to have a full Ontario MC licence issued...though there is no approved procedure and you're sort of at the mercy of whatever clerk happens to call your number.
My wife passed her car test after a year of lessons and practice and now drives every day here in London. Ontario said that she must have held her full licence for 2 years to do a straight swap from a UK licence to an Ontario licence...so she'll probably have to sit the full test to get her Ontario licence. Driving in Canada is a complete joke compared to driving here. Just point the car straight and hit the gas!
I came to London with an Ontario licence which was good on automatic and standard cars. When I hired a car in the UK, I was allowed to drive either. As soon as I switched it to a UK licence they limited me to automatic only. I wonder if, when I return and swap my licence back to an Ontario version, the automatic only restriction will still apply. Not that it matters all that much in Canada, but it's the kind of thing that I'm sort of expecting to happen with this process.