Thanks for these fast replies! :-)
To be sure I wasn´t actually thinking of 'flags of convenience' (though I must say Cook Islands sounds tasty, is it simple to register your boat there?) but simply hoping to (a) buy a decent boat in a decent country, much unlike what I have at home, and (
avoid the hassle of sailing it back here to do re-registration.
Is there much of a problem with arriving at a port with a boat registered in a different country from your passport? Never thought of it! Horrible times these of pretended border security ...
More thoughts/info much welcome!