Yes the G8 was sold in Canada, while there are a tiny number of Caprice PPVs too. One G8 enthusiast passed a village called Holden in Alberta, Canada and snapped this pic.
South Africa has the Chevrolet Lumina which is much the same as the Middle Eastern version, except right hand drive. Unlike the Middle East, there is a ute version available - though also unlike the Middle East, there's no Caprice. This is a modified example at a Top Gear show.
For a bit of trivia, there was also a prototype 'Bitter Vero Sport' which would have been sold in Germany and the Czech Republic if it had gone into production alongside the Caprice-based Vero.
I can recommend my Youtube channel for anyone interested in this topic: http://www.youtube.com/user/wmcapriceforum
As for the Roadpacer, there are vids around, such as this one: