It will likely buckle in the middle. The brake arm will pull down and back (orange). The strap will want to follow the pull (blue). The opposing force will probably buckle somewhere in the middle (green).
![20230725_142940.jpg 20230725_142940.jpg](https://cdn.imagearchive.com/ratrodbikes/data/attach/242/242829-20230725-142940.jpg)
You could add a standard strap, and keep the curved one as decorative, or you'll need to shorten it quite a bit.
![20230725_142746.jpg 20230725_142746.jpg](https://cdn.imagearchive.com/ratrodbikes/data/attach/242/242828-20230725-142746.jpg)
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