That may be simplest, though I'm not sure if uninstalling Keyshot for Alibre it will remove the environment variable (in Windows) that points Keyshot to AD Expert for the inbuilt licence.
If the trial won't work, or opens as Keyshot for CAD/Alibre, you may have to clear/delete the System Environment variable
KEYSHOT_EXTERNAL_LICENSE_FOLDER (make note of the contents in case you want to go back to the CAD version)