You might want to consider the modern Forstner ladder bracelet.
https://www.forstnerbands.co.uk/collections/frontpage/products/the-forstner-ladder-bracelet
The links are screw links, therefore it should be easy to remove and add some new links to your current bracelet. It's obviously not 100% authentic, but the Forstner bracelet closely resembles the Zenith one. It'll be hard to find original GF links I think.
Alternatively, use the new Forstner bracelet and see if you can swap out the clasp for the Zenith one.
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