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There is at least one Australian sparkling that has a beer-bottle-top style seal.

Interesting, I assume you're talking about porcelain flip-tops.[0] I can't say I've ever seen sparkling wine bottled that way. Though, I don't live in Australia or, for that matter, drink much sparkling.

[0] https://en.wikipedia.org/wiki/Flip-top

I was picturing a crown cap https://en.wikipedia.org/wiki/Crown_cork but now I wonder if that would hold the pressure in champagne.

Yep. Those do hold champagne under pressure no problem.

Yes, crown cap is what I was referring to.

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