I wouldn't dare do this…what about the steam making the drivers moist?
I've though about the steam but figured that the hot air from the hair dryer was just as much a problem since the first time you try to open them it takes a really long time with the hair dryer versus the hot water dip only takes 30 seconds to get the entire cup warn enough to soften the glue and Hawaii being so humid most of the time figured the short blast of steam would be the lesser of two evils.