This is probably a bit late however; you will go through considerably fewer sanding sheets if you cut a small slit in the arrangement that connects the sander to your sacrificial Dyson. Dedicated dust extractors have a small "window" that can be opened to prevent the suction from it pulling the sander onto the surface harder than it should be while not effecting the performance of the extractor. This helps to prevent the pad heating up and not only prolonging the life of the sheet but also the backing pad on the sander itself.
The "window" on my eye wateringly expensive portable dust extractor (it's definitely NOT a vacuum cleaner that tool makers give a fancy name to so they can charge more for it) is about 10mm². I was sceptical but it does make a big difference.
This is probably a bit late however; you will go through considerably fewer sanding sheets if you cut a small slit in the arrangement that connects the sander to your sacrificial Dyson. Dedicated dust extractors have a small "window" that can be opened to prevent the suction from it pulling the sander onto the surface harder than it should be while not effecting the performance of the extractor. This helps to prevent the pad heating up and not only prolonging the life of the sheet but also the backing pad on the sander itself.