I’ve always used HandCobbler. She has changed her Etsy store a number of times. And this time, I haven’t figured out if she is still on Etsy and if so, what the store name is now.
However, she has her own website which I have ordered from as well.
We design Straps and Accessories made to fit to embellish Hermes purses. You'll find a range of crossbody straps for Hermes accessories, birkin bag, kelly bag, picotin bag,lindy bag,and more bags.
handcobbler.com
I have ordered more than a dozen canvas straps from her and she has been wonderful. She will customize straps with the leather type (Togo, epsom etc) and color of your choice. I have asked her for other customization too and she has always been super responsive via email.