I like where you are going with it but the only concern I would be worried about is the air coming out the back would make me nervous with air circulation that may contain dust or unwanted particles that could find its way inside the starter. The book Yeast says to keep it away from any drafts or windows. I keep my starters in a pot with a perferated insert inverted on top for ventilation. Everytime I walk into the kitchen I shake it a bit to keep things moving. This also keeps SWMBO from touching anything
For the record I know nothing about stir plates other than they work great for starters.