Bracelet options for Eterna-Matic Kontiki 20

So I’ve always loved the Eterna brand, especially the KonTiki 20’s (jumbo) 37mm from the 1960’s. They take 18mm straps perfectly. And the original bracelets were made for Eterna by Gay Freres. Sadly people ask $300-900 for these bracelets…$300 most likely missing parts, $500 for a bracelet in great condition and up to $900 for almost NOS types. Does anyone know of a company that makes a similar bracelet (with endlinks) that will fit these lovely watches?
Thanks
Stu
UKBRO