If by waste mold you mean a sculptor's mold that cannot be removed from the casting without being destroyed ...
I think the answer has to be no, as the fragile casting would not survive any process that required the the mold to be destroyed to free it.
It may be possible to make a reusable multi-part slip-casting mold from the original clay master. If this can be done without undercuts which would prevent freeing the casting from the mold.
>The thing is that i have a larger sculpture ...
... although large slip-filled molds are heavy and must retain their form during man-handling: e.g. use of natches for registration, holding things firmly together with straps, ...
