It's more complex than just having the cart and disc; you'd need the extra SIMs and whatnot.... it'd be a complicated and risky install - if the power fluctuates, you lose your security cart. The install also happens to take 48 minutes.
Buy the setup, sell 2I. Trust me, it's easier that way. Should be able to get your money back out of the 2I setup pretty easily, I'd think
oh yea i forgot im lacking some ram carts..... duhhh lol.... i just dont have all that cash right now... im working on getting some monster items at the moment. ill see what i can do though.