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Venting a chimney

Bit of a building question but wondered if someone might be able to help to save me having to get someone in to do a simple job...

My c1900 house chimney has 2 flues, which were both not vented. I've now put a vent to one of the flues in the upstairs room which was a relatively easy job as the fireplace was simply covered with plasterboard.

What is the least destructive way of venting the other (adjacent) flue? Could I get away with simply drilling a few holes through the now vented flue to get some airflow between the two, or do I need to destroy the wall to vent the other flue properly by inserting an airbrick (pain to do as wall is plasterboarded and plastered)? Another easier alternative would seem to be just drilling holes through the plasterboard into the brick for the unvented flue, rather than removing all the plaster and making a big hole in the wall.

Either of my easier options likely to work? Any advice much appreciated.
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