Lucchini would be a good one for it, but a better one would probably be one of the 'missing' SDM house members, Patchouli. Not sure if G intends to bring her and Koakuma in at some point, though, so having one of the 501st witches knowing the methodology would be nice.

Of course, they already have a fair stockpile, so this may be a moot argument to begin with.