I am not on the BBKA list but will respond to in-village calls so better to think this through now than when put on-the-spot.
The risk is from people directly and indirectly if you touch objects that infected people have touched and then put your hands to your mouth or eyes.
You are not going to catch it over the telephone and I am not answering the door to anyone, any conversation is going to be from an upstairs window.
If I am going to go to a swarm then the rule is surely simple - access has to be open, no people anywhere near me, wear nitrile gloves and dispose of them afterwards. If they don't follow the rules, turn round and leave them to it.