Ok, I decided to not go for the full vacuum seal option at this stage, but came up with this..
The tube is thin, soft and flexible. I can easily hold it about 3-5mm above a certain spot on the sensor, using my LED headlamp, thus concentrating the suction on a specific spot. The suction is also reduced due to the thin tube.
As I am still sticking to my original comment as the best method,
Originally posted by altopiet
+1
@Julie, I see you have a few lenses, thus your chances of getting dust on the sensor increase every time you change lenses. If you can change lenses in a place where dust would be at a minimum, like a bathroom, or a room where there is no draught, keeping the camera mount pointing down when you mount the lens, after you've cleaned the back of the lens with a blower, the chances of getting dust on the sensor will be minimal. I usually check for dust as soon as possible after changing lenses, because if some dust did manage to get in, it will still be loose and possible to remove with a blower. I found that if you try and remove dust after using the camera for a while, it seems as if the heat of the sensor tends to weld the dust to the sensor, making the removal more difficult, and sometimes the only option is a wet clean. The old saying of "prevention is better than cure" is applicable.

and haven't had any dust problems for a while, I'll wait till the next spot appear, to test the setup