After extensive searching (and some help with where to look from another forum member @Rtheff) I finally found a bracelet that will work with the Doxa clasp and end links on my 300T that doesn't have the historical accurate but pretty ugly flare to it and I'm very pleased. Only $40 shipped from Germany to the US.

The good:
- Finishing looks the same (polished is reflecting different in the below because of the difference in middle link profile)
-Clasp and end links both...

20mm flare-less bracelet option for 300T