Any truly competent strap maker can custom make a strap to your specifications--Toshi is just one of many fine artisans available. They can make straps not only for the Militare but also the Dino Zei line, as well as the regular spec watches. There is a great list of strap makers in the Officine Panerai thread: https://www.watchuseek.com/f75/straps-comprehensive-list-230129.html
I tend to shy away from the more expensive offerings on the list, as I have found that strap makers such as Toshi, Gunny, Kain Heritage, and a few more do just as good of a job, if not better, than some of those listed at two or three times the price.
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