Using بسم اللہ At Start Of Any Work.
The words, with the name of Allah, get their meaning according to the context and the work being started with it. Describing of one contextual meanings doesn’t mean that other connotations are absent. Moreover in a report from the prophet He mentioned that any work done without tasmia will be devoid of Barakat and hence incomplete. Since Tasmia contains Rehman and Raheem, it doesn’t not go with Sura Tawba which is of the wrath of God. It doesn’t mean we cannot recite tasmia with the Surah, it just does not seem appropriate.