You don't say what XPS model you have, but most desktop computers have a BIOS option to ignore "Missing Keyboard" errors on startup.
I use a Logitech Bluetooth keyboard and mouse to control both my HP Laptop and my Dell XPS desktop. When I boot up the Dell I get an error screen telling me there is no keyboard attached (probably because Bluetooth is not yet turned on). I solved the problem by plugging in a USB keyboard and placing it on the floor behind my desk. Is there any other way to shut off this error so I don't have to have two keyboards plugged in?
XPS 8940, keyboard missing error