“Can the person caring for the person use the Kosher Light Switch and feel good that they are not violating any of the hilchos Shabbos?”
Poskim wont change the tzurah of shabbos in order to prevent people from being over a lav or to ease their emotional discomfort- better to tell them the right thing to do over and over again and hope they change- appose us changing for them. A rov needs to be consulted for the questions of hospitals and the like. From what I have learned and heard, there is essentially no place for the kosher switch in our homes.
We see that the rabonim created a tzurah of shabbos- we should have the table set nicely, light candles, drink the meal over wine, we cannot ride on a horse because we “may break a twig”- the underlying reason is the rabbis did not want people’s shabbos to look like a weekday and riding on a horse and the like would ruin the tzurah. Its not only what is technically permitted that matters. The kosher switch has both very real melacha issues and zilzul issues and I dont see it having any place in the Jewish home now or in the future.