I mean I'm going to explain to you what may happen if you try do this.
1. You're going to be unable to find a group like this, as most are plagued with referral links and people trying to sell their 'gambling secrets' or whatever else scam shit the gambling scene is plagued with these days.
2. You're going to find a small group that suits your needs, but slowly the admins / mods of the group will want to make some money off the group so they will SLOWLY have it become the gambling scene like above.
Just stick to reddit gambling forums, these groups are going to be all BS and filled with scams anyway.
Thanks for the advice. I'll stick to reddit. You're right about BS/scam being all over the place.