Not sure if such scrips exists although as I have a custom G3F char created from blending different existing heads and if it possible I would like to remake it as G8F.
The first script requires manually to add every morph, which is, as we say "a work for the whole China"; the second script should be able to do the work but unfortunately no matter how many times read the tutorial. couldn't not make it to work at ll - obviously i misunderstand something.