I need to run chases for a light switch and power socket (in separate locations) from first floor down to ground floor. The ceiling at ground floor has plaster coving (approx 4" profile).

Is it feasible/practicable to chase behind the coving, or at least provide a path for the cable conduit without disturbing the coving? If so how?

I really do not want to get into replacing the coving - or do I? I imagine that it is a wretched job with great risk of not being able to match what I remove.

TIA

Richard