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Was fiddling with Computron some more and found out that PE hands fit perfectly inside his chest cavity if you need a place to store it while using Nosecone's drill as a weapon. Just tuck the thumb and the gun-mode peg handle into the palm and it slides right in perfectly.
Works for Superion as well and probably any other Silverbolt mold torso combiner as well, but I don't own any others to try.
It fits in pretty snug. It doesn't get in the way of closing the panels fully in any way but it's still tight enough to not rattle around in there if you shake it.