Not familiar with Mr Kraus. Shortcut to remembering how to pronounce Sòller is to say 'So yeah'. We're surrounded by scarcely-maintained groves with owners pleading to do something with the fruit and there's only so many marmalades (wrong kind of oranges) or Aperol copycats one can make. Orange blossom ice cream a big success this year.
Fet a Sòller. The guy is a German who noticed the same problem in the 90s and figured to use the surplus for making ice cream & marketing it to the Vitamin C starved people in Germany.
Perhaps an artisanal single-origin soda could work? Use the pulp and the oil from the peels to make some form of syrup or concentrate locally. Mix it with water and label it in Hamburg, London, Stockholm.
Can you ask your neighbors if they’ll sell an all you-can-pick pass in Febrary? I know two families who would buy it in an instant. There's an email address in my bio here.
In fact, I think I haven't met a tourist on the island who wasn't interested when I told them that we visited a grove and picked some oranges. Especially those with kids! Someone could set up a website that allows you to buy such a pass that directly routes you to the appropriate grove. You can spread the word about that website by collaborating with small local businesses like car rentals, hotels, Airbnbs, etc.. I’m sure many of them would be delighted to put such a flyer into their welcome kit.