ok! I found a quick free way
the only thing to do is replace on the file the:

targetGeom Custom_Morph

with :

// targetGeom Custom_Morph

poser than reads it as a comment and on the next save will not save the Custom_Morph info

so with a replace all on  EditPad job done

it took some time to figure out but this should be useful for the future also

of course you have to do that after you spawn the new morph with a different name...

My FreeStuff