”I believe that it is the shita of Rishonim that one is only chayav for ksav ashuris. See the Chayei Adam shabbos 37:5 (“rov” poskim etc.)”
You make it sound as if the chayei adam brings this down from rov haposkim. However if you look at his words you will see there is no way of using this as a heter for texting. and only bdochek does the chayaei adam say tzorich iyun if you can ask a goy to write in another language ltzoirech mitzvah. ( the rama holds you can be soimech ltzoirech mitzvah while the chayei adam is mesupak)
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