Hello,
Yes this is possible. The CueCore includes a template for this conversion, in the 'show control' page you can find a list of templates, including the 'Art-Net -> DMX' template This is the one you should use. Further more, you can select the input universes you want to use in the settings page of the CueCore. Good luck and have fun with our products. Also, please let us no if you need any further assistance.
Best regards,
Jurrien