I've met some pretty amazing arrange arranger keyboardist during my travels to Mexico. None of them referred to their keyboards as "arranger keyboards" in fact they were completely unaware of the term unless they happen to speak English and visit websites such as this. I believe most of the Mexican keyboard referred to their arrange a keyboard as " teclado con ritmos" which means " keyboard with rhythms " That seems to make sense to me. Maybe call it a " rhythm keyboard" or how about " chord recognition keyboard"
Either way ,the name doesn't really matter to me or does the acceptance/status of the instrument. I love playing with my "rhythmic keyboard " Wiorks great for my needs!