I realize this was said in jest, but I have thought about it because of experiences with Mormons who use water. I think the answer is yes. Whether it should is a different matter. I think in cases of nesseciaty, it is permissible to substitute other substances for the elements. It's not the intrinsic nature of the elements that are salvific, but rather the promise attached to them. Now like I said, substitution should only be used for reasons of necessity. For instance, Jesus used bread and wine. However, while they did have significance in Jewish practice, they were also something that was readily available. Let's say you have somebody who is an alcoholic, and not able to take in wheat for some medical reason. Are they then banned from communion? But, if necessity does require a substitution, then it should be done in a dignified manner, and not focused upon.