Dr. Bob - "Deacon" is more verb than noun, as I'm sure you would agree. Thus the one church-type usage, Rom. 16:1, has to do with service or ministry, as the word is often translated. E.g., Peter's wife's mother "deaconed" unto them after she was healed; the servants at the Cana wedding
"deaconed" with the water turned to wine, etc.
You would certainly accept Paul's words as being valid, though obviously many do not. There are some clear limits, to some degree cultural but originally rooted in the fall where "Adam was not deceived."
Re witnessing/visitation groups: best set-up I ever saw was in Chicago. Husband-wife teams came to church (often straight from work), prayed over the prospect cards, went out as couples, with one or two families staying at church to take care of the children and cook a meal. When everyone got back in, they shared what God had done as they ate together.
This was one or two nights a week, usually different couples if two nights. That avoided lots of issues, gave some safety, opened lots of doors.
Merry and holy CHRIST-day! Charles - Ro. 8:28