This is a good list.
I think Liechtenstein/Switzerland is a great place for anyone who want to stay in Europe but outside of EU.
Ukraine used to be very good unironically, Kiev and Lviv were like a modern Czech or Polish city but with much cheaper prices, but unsure when it will be visitable again.
Serbia/Montenegro good for a Proof of Address but if you are used to modern European cities you might get disappointed.
What you can do︀ is live in Hungary and get an official address in Serbia, lots of Hungarians live︁ in Serbia so many law offices can help you with that.
Hungary is in the︂ EU but many of the EU bulls**t doesn't apply here.
Some maintain address in Ukraine,︃ Georgia, Belarus or Russia but really live in Poland.
Poland used to be great, Warsaw︄ and Krakow are nice cities but since the new government they went full libtard, 4︅ years and they will be worse France or Germany, mark my words.
UK is no︆ longer good imo, it is becoming more and more of a survaillance state, and the︇ tax is a nightmare, even just ordering simple products from EEA.