Hello Emerson,
Welcome to Microsoft Community.
Before I answer your question, let me share with you a support document from Microsoft:
Surface supported operating systems - Surface | Microsoft Learn
If you're currently using a Surface Pro 11 with a Snapdragon processor, that model only supports Windows 11.
In theory, the current mainstream Surface series devices support USB boot:
Boot Surface from a USB device - Microsoft Support
Note, however, that the Surface-specific USB drives covered in this article are different from the ones you mentioned in the thread.
You will first need to download a Surface dedicated recovery image with the serial number, and then follow the instructions to complete the creation of a dedicated USB recovery drive:
Creating and using a USB recovery drive for Surface - Microsoft Support ****
Only the USB recovery drive created in this way can be used to boot the Surface via USB.
But that's probably not possible, because the Surface Pro 11 doesn't have a Windows 10 version of the recovery image.
Therefore, your requirements may not be realized, Surface series devices, due to their particularity, only recognize the dedicated USB recovery drive created by special means, and the external USB drive created by the conventional process is not recognized.
Best Regards,
Mitchell | Microsoft Community Support Specialist