Svalbard is a bit tricky - while it is part of Norway (which itself is part of the ESA), it has military restrictions, and other countries can operate commercially from there.

There is a (suborbital) rocket launch facility there to study aurora etc, but it's limited to 4 launches per year.

Greenland could be a good site -- I believe they are still a member of ESA through Denmark, so Qaanaaq would be a great place for polar launches, weather and access permitting.