In my Congo right up until I left we let DF'd ones sit where they wanted, usually with family.
It makes the Congregation uncomfortable ? the Congregation should stop shunning then.
I would always greet and speak with DF'd ones at the KH or out in Public places, I was not an Elder, but was never censured for it. A liberal Congregation is the explanation, it was different just down the road in the next K.H
If I was "in" now the only person I would shun would be a known Paedophile, and I would shun them now I am out too.