I cannot comment about Transport Canada and NZ as I do not have any knowledge of them. However it is possible to obtain FAA ratings in the UK if time away from work is an issue. Most people do not go this way because of greater costs in the UK, but if it suites your circumstanses, then go for it.
You will still need TSA security clearance to do most ratings though, even if done here in the UK see
https://www.flightschoolcandidates.gov/
Remember also there IS work available outside the US on an FAA ticket. Not saying it will be easy, but rise to the challange and you will suceed.
Good luck to you and never give up.