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You may have an existing driver which is already signed before but then you may need to add some variants (eg: adding some VID/PID combination to an existing driver package), it will break the existing signature of the driver package.
There is a way to install this new driver package without getting a new EV signing certificate.
The method is actually generic and not limiting to USB drivers. You should be able to sign the driver package by using the same method and then create an installer.
You can use dpscat (which uses libwdi) from libusbk project to make things a bit easier. You can use it to sign the driver package and then use dpinst/dpinst64 to install the driver package, you can also create a driver installer.
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