Both my '93 and '95 Trooper had this feature, and IIRC so did the JDM Rodeos. If I'm not further mistaken doesn't the VX use Rodeo mirrors? If so, you should be able to get Rodeo power mirrors from overseas and then a simple relay circuit off the ignition power will do exactly what you want.

If you put a switch inside to manually control the folding be sure that it's out of the passengers reach. With the Troopers my friends would constantly be folding the mirrors in and out while I was trying to deal with folk at a drive-thru.