Hmmmm.... I think the 'N' makes your plan immediately restrictive, without even going into what aerial work you might be able to do with a full PPL, which is basically none.
The National Private Pilots License I though restricted flying to UK registered aircraft within UK airspace, so "out of the country" would be fairly restricted. I'm sure there are places abroad where you could fly somehow on an NPPL but I expect it is a short list!