-there is not enought ferromagnetic material in the pump that would suck it into the magnet if it is hangin on the clip on your waist. The magnetic field WILL however damage the circuits and possibly discharge large amount of insulin into the wearer
-The idea with the chain is ridiculous... while I understand you're trying to make it easier for the wearer you're missing a crucial point.
There can be NOTHING ferromagnetic (electronics included) that can be taken into the MRI room without either becoming a danger to the patient or damaging the electronics
Thus the MRI tech. is no different than an MRI tech who wears an insulin pump. They BOTH have to remove anything in their pockets before entering the room. Weather it's a cell phone or an insulin pump.
We're beating a dead horse here.... to finalize things...being a pump wearer would not automatically disqualify you from working with MRI's
I'll be glad to answer anyone else questions regarding this... even with my limited experiece with MRI's.