There are ways that you can briefly greet AUH stopover passengers without Al Hosn. If you stay within the airport, even land side, you will not need Alhosn. Your stopover visitor could also come to your private home for a few hours or visit the outside area of a cafe near the airport (try places in Etihad Plaza or Al Muneera Beach Plaza, both less than a 10-minute taxi ride away with outdoor seating). Don't forget if they're taking any sort of public transport during a short stopover, a face mask will be needed for this. Visiting a tourist attraction or indoor dining, you and your stopover guest will need Al Hosn.