The figure Satako came with INJposes to apply the head to different figures I believe... you could look it up in the store and see if the author could help you. Kirwyn uses an INJpose to establish geometry switching on the character "K" available in freestuff here. Please report back if you find anything out :)

I have used "replace body part prop" and then injected the appropriate morphs belonging to the prop but Poser doesn't always shade properly across the junction on the new mesh because of vertice order or something. I have always wanted a Poser 'Gilmore Girl" skinny scarf as a 'universal" neck join.