You could add your Bluetooth driver in to Windows image by the following method
Add and Remove Drivers to an offline Windows Image
https://learn.microsoft.com/en-us/windows-hardware/manufacture/desktop/add-and-remove-drivers-to-an-offline-windows-image
There is not a Microsoft website to download bluetooth stack for windows 10, you need to search suitable Bluetooth stack for your device on manufacturer website.
Microsoft only have these guide documents
https://learn.microsoft.com/en-us/windows-hardware/drivers/bluetooth/using-the-bluetooth-driver-stack
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