I would highly recommend your contacting the manufacturer to ask if they have an factory kit that can be field installed to better protect the operator.
I know of 2 lift truck manufacturers that do provide an optional kit for their model of electrics and quite possibly your manufacturer may have as well.
It is very possible that a dealer's rep may not be aware of the options and sometimes answers can be too quickly given without knowledge or research so....go to the manufacturer to get an answer. Most of them have a website where you can "contact them" with a question.