I think you covered them. They're not in the hive but settled outside, so treat as you would any other swarm - shake,brush smoke whatever into a skep or box, leave on the floor until they settle and put into hive.
Isn't there a reference in Seeley's book of a swarm in post war Berlin that doggedly stayed clustered on a balcony for weeks as a consensus couldn't be reached as to where to settle - they eventually perished.