https://www-cruisediary-de.translate.goog/vista-concierge-level-veranda-kabine-9040/?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=wapp
Looks like the bottom shelf of the upper cabinet
They have to clear customs/immigration before anyone can get off the ship on July 12th. You could get off anytime after that. Only issue is your luggage. You will need to pack that off yourself if you want to get off the ship early. Just to be extra safe, I would contact your TA or Oceania about your plans so that you have it in writing that they have no issue with this.
I don't know what the previous mocktails were, but these new ones (according to the posted pics) have Lyre non-alcoholic spirits. Those spirits are not cheap. They are very close in taste to the 'real' thing, when in a cocktail.
I assume that Oceania will need to do what the Coral Princess did and have divers clean off the hull. https://www.cruisemapper.com/news/11274-coral-princess-skips-port-calls