That's what I did awhile back when GM was having Q/C issues. I used a cast slave as a donar for the internals and stuffed them into a DOM body.
I guess you could do it to the master. I don't see why not. I never did because my car isn't a NCRS type car so I never tried. You can't see the master so I just didn't bother, the cast slaves don't fit well on the stock studs, the studs are too short to get many threads caught on the nuts. That was the only reason I did the internals swap. I did that at least three yrs & 20k miles ago and it's still working fine.
Tom