If I were making my own, I think I'd use rigid plastic tubing, to avoid the cold weather issues.
I've experienced both lip and tongue frozen to cold metal. I have no desire to repeat either. Ever.
(Both were when I was young and stupider. The tongue was a "Would that really happen?", and the lip was on a dare, because I thought they wouldn't stick if I wiped them with my hand first. I was wrong.)
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Okey-dokey. What's plan B?