Looks delicious! First time I've heard of Cherry Cider! This would be fantastic year round, not just in the fall. Wish I could find Cherry Cider in the Big Apple, NYC.
That machine is way out of my price range but I did have a thought. What if you chilled the glasses before filling? It would seem to delay the liquid showing up.
Looks amazing! Cider is special stuff. Never thought of slushing it. But I am a weird person. Cold drinks, I love. But slushies and ice cream, which I love, give me killer frozen brain syndrome. Have to keep hot water nearby to cure it. It's all very silly