Hi!
I had a go at contacting NavCanada a couple of months back, this was the answer i was given;
NAV CANADA has had the opportunity to review the current Experienced Controller Program and have decided to not continue with this initiative. Our results to date have not met our expectations and with this, NAV CANADA will not be considering applications from foreign controllers. You are however, more than welcome to apply under the regular stream if you wish to do so providing you meet all the prerequisites to apply.
So not that welcoming at the moment
Good luck anyway!