Your question appears to be asking why it would not be kosher to use an Aramaic Torah scroll in lieu of a Hebrew one.  You may want to reword your question.  Throughout Jewish history and up until the present, Aramaic targumim have been recited in the synagogue alongside the traditional Hebrew Torah.  Currently the Jews of Yemen read from Targum Onkelos during the Torah reading.  However, the practice of solely reading from a scroll written in a language other than Hebrew, such as Aramaic or Greek, was never common practice.  There are many reasons for this, a few of which are given below.


The Talmud [Sotah 33] discusses praying in Aramaic instead of Hebrew and states that the angels do not understand Aramaic.  The message here is that Hebrew is preferable over Aramaic since it allows the person reciting it to have a closer connection to heaven.
This notion is further reinforced by the practice שנים מקרא ואחד תרגום [Berakhot 8a].  This is referring to the practice of twice reading the weekly Torah portion in Hebrew with the congregation, while reading once from the Targum.
There is a general concept in Rabbinic writings that Hebrew is the holy language in which the Torah was given to Moses on Mount Sinai.  Therefore, as a general rule we should be using Hebrew over any other language.


Why can't a Sefer Torah be written in Aramaic?
What I would like to do is add a product and a coupon to the cart at the same time from a product page.

The reasoning behind this is we are creating a landing page for a specific coupon and want to add both the product and coupon to the cart with only a single click for the user.
