"shoot multiple frames
make prints of all of them, swap heads ( blinking heads for non )
make a copy photograph of the collage'd group portrait
retouch it so you don't see the shadow / line
and then make the print."
uh, I am sorry but I think that is what a digital camera is for...IMHO at least :-) and no, I don't charge enough for the above solution
Les chaussettes de l'archiduchesse sont-elles sèches? Archi-sèches!