You could spend 5000€ on a Hasselblad XPan. Or you could get 65×24 for free in the App Store. apps.apple.com/us/app/65-24-p…
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Not sure what you’re talking about, but the viewfinder/image output in 65x24 is (as the name suggests) 65:24 (2.70), not 21:9 (2.33)
Well the viewfinder/output is basically cropped up 16:9 which gives the wider feel and since 21:9 is more known and not 65x24 I mentioned that, It's a neat trick though.