When I read your post, I had to sit and think about it for some time.
In Paul's day, with respect to the book of Romans, eating clean or unclean meats was a very controversial issue much like alcohol is today.
He says
"I know and am convinced by the Lord Jesus that there is nothing unclean of itself; but to him who considers anything to be unclean, to him it is unclean."
Paul had no personal issue with unclean meats (meat offered to idols), but he recognized the fact that some people did.
A verse that does come into mind is 1 Corinthians 8:13:
"Therefore, if food makes my brother stumble, I will never eat meat, lest I make my brother stumble."
I'm not going to stop drinking at a pub with my friends or at my home, but I'll refrain from bringing it if I have someone over where it may offend.
Paul didn't set up a "unclean meats group swap shop" in the church even though he knew there was no issue with it. He knew it was controversial and was more concerned about his fellow brothers and potential stumbling blocks.
Totally understand the fellowship aspect of the group, but I don't see why it has to be a church group. If your dad is looking to set up a homebrew group with you with christian friends, why not have it as that? A homebrew group, not a church homebrew group.