Third this. Just change and heck care. A bit of dust won't kill your camera! Worst case just send for cleaning or just buy one of those sensor cleaning tools. It's very easy to clean the sensor these days, it's ridiculous!
if you are really concern about dust... always bring plastic bag big enough to fit the camera and one hand to change your lens... im sure this will help a lot to avoid dust getting in to your sensor... but make sure of course that your bag is dust free...
but im not practicing this one... coz i dont care at all with those dust.... :bsmilie: :bsmilie:
Aha! This gives me an idea... get one of those small battery-powered / usb-powered air ioniser... turn it on and change lens near it... dust will be attracted to ioniser more than to the sensor as ioniser has higher voltage at its ion-producing tips