The Circle as you call it is just a hurdle to be jumped as are hurdles anywhere in the world when you go to change country for a variety of reasons.
Let's deal with Canada.
If the job is advertized then you might be the only applicant, No Canadian might wish to take the job for obvious reasons.
Prior to applying you need to satisfy the prerequisites, written exams, medical, etc. That gives you a CPL.. Once you line up a job, then you will need to have the job offer and paperwork in hand and exit the country for a Canadian High Commission probably in the USA.
Then its a drive back, fresh work permit and you do a PPC and or instrument rating ride if required.
Then you are working but, only for that specific employer.
There there is nothing much stopping you from changing employer except ramp checks or border crossings that would leave your outside of Canada or arrested as border official can and do ask for pilot licenses.
Once you have that first job, you will then need to satisfy the other grounds that will enable you to legally change jobs and or your status in
Canada.
So, you can come to Canada as a tourist, find a job, get a work permit and work for an operator that no Canadian Pilot is willing to work for which should give you some stark warnings about your likely length of employment.
It's not for the easily discouraged and it won't be easy, it will be be more difficult than the vast majority of Canadian pilots are capable of contemplating because they have not been and won't be in such a situation.
Expect to encounter low life personalities who hate foreigners no matter where you come from.
Just read the defamatory personal attacks on this forum.