Technically possible of course, but someone has to have the time and inclination to do it. Therefore, I yield the floor to anyone who'd like to put their hand up and undertake the task; unfortunately I personally lack the expertise and know-how to do that.
Some manipulation would need to take place. They won't cause the game to crash, but 08's hair files don't show up properly in 06, nor do 08 headshapes work properly with headbands in 06.