The reason the camcorder gets this alarm is not from moisture already in there, it is from condensation because the camcorder is colder than the warm, moist air around it when you take it outside. You can pack it in anything you want, as soon as you expose it cold to the warm, humid air, just like a cold bottle of water, it will condense moisture in the air, and that includes on the inside, that's where the moisture alarm comes from.
All I have done to compensate for this, is when I plan to take it outside, I do use the built in hair dryer thru the tape loading door(no tape inside), until the camcorder feels warm in my hand, then I go outside, make sure it's acclimated, and then load a tape and go.
I agree it is a pain, but it is not giving you an alarm for no reason. If you were to operate it wet, and it IS getting wet inside, you would damage it.