Blocking up builders opening left by fireplace

Do you think ill be okay damp wise by just fixing some DPM to the single skin wall and then filling with rockwool?

Its down a side alley and next doors side alley is next to it, so doesent really get any direct rainfall, and obviously its not a chimney.
I expect so but I would try to seal the edges to the existing at least along the top and sides.
 
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