Col's M4K4 Mixer seems to be gone from the marketplace. Too bad. I use it all the time to mix the adults and kids. It was written for M4 and K4 but you can sub in V4 for M4. It also can be used on Gen 3 and Gen 2 adults and kids with a little work. One of the great advantages is it adapted the clothing along with the figure. You could try site mailing him to see if he will make a private sale. There is a long thread here in the forum on how it works.

Col also sells his Poser Morph Loader on his site. I found it handles many morph issues other products can't.