From your post, it seems you already have a consultant to work with. Why don't you ask him/her to provide you a complete solution for this situation? Or other option would be to work with a QlikView partner.
It seems you already have a enterprise version of publisher. So you can schedule your reloads using publisher. You shouldn't need to get additional scheduler software.
QVS files are just script files exported from QVWs. You would need to put an "Include" command in a QVW file to run a QVS file. Or you would need to import the whole code into QVW document to be able to run it. The QVS files cannot be executed by themselves.
Hope this helps.