Johnny You've kind of hit on my points, there's no specific call out stating I can, or cannot, therefore it may be in my best interest to do as you suggested and contacting the WI body regarding the legality of the issue. As everyone has pointed out, it is illegal to sell homebrew, which we all are aware of.
However as a donation to a charity, where does the law sit on that? and can a charity then sell the product considering they are not the brewer, or perhaps an event ticket allowing them to use as they please such as on a beer or something of the sort.
Honestly I could care less about deducting it from my taxes, it was just something i thought of as i was drafting this posts