We are blessed in Australia to have access to very cheap wine , I see no reason why a cask wine wouldn't work, at the end of the day once its all blended up with the aperol/glampari you would have super taste buds to differentiate between a carbonated cask wine and bottled Prosecco. I will give it a go with a 10lt keg and see how it turns out. I will email you guys with order number , when do you think you will be re stocking the Glampari ?
The name "Glampari" was a little to close to "Campari" so we now call this Red Italian Bitter but it's the same product inside the sachet.
https://kegland.com.au/products/impressence-glampari-aperitif-bitter-spirit-flavouring
We are out of stock as we have run out of raw materials. 2 of the raw materials are currently being shipped from Italy and should arrive next week. So I would say should have more of the Glampari/Campari/Red Italian Bitter on the website in about 2 weeks.