As far as I know, the manual therapy course in U of West Ontario offers part-time programme. However, I am not sure about how easy to get into the programme as this is the first and only one in Ontario and I guess it is rather competitive. Of course, if you enrol as an overseas applicant, it may also be different as overseas applicants pay more for the university fee.
I don't know anybody studying in NZ. You need a registration to study there. But such registration is different from a full registration to work there. I don't think it's difficult to get registration for studying and you'd better check on the NZ board. But still, as such registration is different from a full registration, if you eventually want to work there, you need a frull registration in NZ.
If I were you, I would consider what to study first, then check which university will provide such programmes. Of course, has to budget the fee and living costs. I assume overall, NZ, Canada and Aus will be cheaper than UK and US. Honest, if I want to have post-graudate study really related to physio, Australia will be my first choice.