You would clearly not be following the rules. The Arabian Airpass is an extension of your international ticket and will appear in the same record. Thus your Arabian Airpass would be linked to your Y ticket from DEL to DXB. If you used another ticket to get from DEL to DXB, then your Y ticket would be canceled and the Arabian Airpass would be invalid. EK specifically offers this for people originating outside the region and it is similar to a visit USA pass which can not be used by US citizens or a Visit Europe pass which can only be used by people originating outside Europe that are not citizens of Europe.