Exporting geometry shell to iClone to use Jepe's body and facial hair on a Genesis character

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Creating a new geometry shell for a Genesis character seemed the perfect way to use Jepe's body and facial hair on this character since it seems impossible to fit a Genesis character to another Genesis character. But my goal was to export my character to iClone and I didn't find a way to make the geometry shell conform itself to the character in 3dXchange. Did someone ever find a solution to this kind of problem?