I am attempting to repair a rounded plaster corner. (Image below). The plaster was blown out during an electrical re-wire for the bathroom switch pictured.
I’m assuming the wire corner bead runs vertically along the entire corner, floor to ceiling. There are parts of the blowout with no wood.
Question is - what is the PROPER way to repair this? Should I tie in a scrap piece of lath to the existing where it’s missing or can I treat this like a drywall patch and patch in a rectangular piece of drywall with some blocking?
Also, can I use a fast setting compound (20 or 45) and finish with a topping coat of joint compound - or should I use PlasterMagic, or another plaster alternative?
I’ll be painting the entire bathroom after the repairs.