Just don't go this one year Noam. Tell the group you have something else going on and it just isn't going to work. The environment is the most fraught one can think of for drinking other than inside a pub all by yourself. It is fine to take a year off and I'm sure some have missed here and there.
If you do decide to go, I don't think you need to shout from the mountain tops and beat your chest about being sober. Just tell the guys right now you aren't drinking and you are working on some health issues. That's the honest truth. It will be as big of a deal as you make it.
It is a pretty typical topic around here in early sobriety - being worried about people seeing you not drink. The truth is most people won't even notice what you are drinking and not drinking. We addicts are a very self-centered bunch and come to find out the world, even close friends, do not monitor our every move.
To be clear, my vote is skip this year as you have bigger fish to fry right now.