Skip Vienna.
Skip Brugge
Skip Budapest.
Skip Milan.
Skip Brussels.
Fly to Zürich and go to Berner Oberland.
Add Rome.
Use Naples as train station and port destination only.

Paris (3)
Amsterdam (3)
Berlin (3)
Prague (3) Fly to Zürich/Geneva
Berner Oberland (3) Take train to Rome.
Rome (3)
Sorrento (3)
Capri (2)
Fly home from Naples

ttt