Looks like a good option. I found something like this: E/Port Plus 210W Port Replicator for Select Dell Latitude Laptops / Precision Mobile WorkStations : Laptop/Notebook Accessories | Delltl;dr
you can consider buying a docking station, dell has few models with parallel port and serial ports along with vga and other connectors.
you can connect all your devices to this docking station and just dock the laptop, when on move just detach your laptop and go mobile![]()
But very expensive (real pro stuff!

^Yes its very easy to switch if OPTIMUS is there.