Okay... so, do we want to actually do this? If so, I'll need to ask a ton of questions.
First, how exactly does the CC consume? If I'm understanding the generic message error correctly, you just equip the gear of the familiar you want it to emulate, and it automatically consumes it, right?
Second, when does the item disappear? Does it disappear after the ~45 adventures, or immediately? It's not completely clear, especially as it talks about unequipping items to shift it back to pure CC. If it disappears immediately, and you equip another of the same type, does that provide +5 weight while equipped, or is it just immediately consumed again?
Third, what do we want to accomplish? Do we want to just set the item that you want it to auto-equip if possible, or do we want to be able to run this through some sort of modifier-maximizer type thing where you can give it a goal like meat or items or exp and it'll try to consume the best possible? This is more dangerous if the second, because anything (in the consumable set) might get picked if it provides the best gain...
Fourth, I suppose, is whether or not we want to allow automatic consumption of your last item of a specific type, or how exactly that should be handled... Allow for last consumption if you don't actually have the familiar, but keep one if you do?
Probably enough to start working on (if there's actual call for it) after we have some of those answers... initially at least, it'll likely be manually set just with the set CLI command, but might someday toss an actual menu around it. I don't have one, but if people will actually test and let me know, I'll do the work to make it happen...