I would do a sort of Bailey comb exchange.
Move hive to one side
Take roof off and carefully turn over and put flat on original site with comb pointing skywards.
Take an empty super or brood box depending on the length if the wild comb and place inside the roof.
Place a small eke with entrance on the super and put a brood box on top with foundation then a crown board and new roof.
Bees will draw foundation and when queen starts to lay put a queen excluder under the eke.
The roof with wild comb can be removed after all brood has emerged and an OMF put in its place.