Good post Radix.
I don't keep alcohol in my house either,
But if a guest showed up not knowing and brought a bottle of champagne, I would probably feel awkward saying something depending upon the situation.
I don't feel the personal temptation would be that great for me .
But I understand also that it could be a good plan to have some sort of graceful declining statement handy for in the future.
You handled things well tho.