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I hope this is not forbidden, but if you print the goggles at 92% of their original size, then they can be used for the "steampunk diaphrahm" https://www.thingiverse.com/thing:2019585

No idea by how much you would need to enlarge that one to get it fit the original goggles... by 8% to 108% maybe?

Iris Diaphragm for Steampunk Goggles