I was in Ireland at the end of August and discovered the "7up Mojito free" there - and was simply thrilled! :-D Refreshing, "minty", sweet...and free of calories and sugar. In the meantime, it has apparently also been launched in Germany - at least as a limited edition.
Migros already carries the 7up free Grapefruit - which I absolutely love and always "fix" new people with it, who are then also thrilled ;)
I'm sure the Mojito version would go down well here too, could you think about it? :-)
Best regards