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If it were me I'd strip back to the brick in the alcove, then dotndab some plasterboard onto the brick so that it finishes flushish (ideally it wants to sit 1-2mm behind) with the front wall.
Next fill behind the plasterboard at the front edge with bonding to almost level with the front of the plasterboard.
Staple the anglebead to the plasterboard so that the bead sits level with the finished plaster on the front wall and skim everything with multifinish feathering it out as best you can at the edges.
Sand it all (you may need to do a lot of this).
Bobbo-
Thanks. This seems a faff but probably the most achievable way I can get the smoothest finish. It'll be largely hidden when the fridge is in so I'm not super fussed on perfection but want it decent and also needs to be at a stage the electrician can get in and finish wiring back there (sooner rather than later) so plasterboard seems a sensible choice here?
CYOA
😂
Can you get 'wide' angle bead? I.e. it's longer on one corner - about 6 inches long or something to drill into the inside alcove wall? Or would very long screws work? Or drill a strip of wood in place (2x2" or something the height of the wall?) to cover that corner and prep for some bead?
The area around the channels slopes up and down to it, much more than some sanding will do tbh. Something like the attached but worse and repeated four times over three walls.
PS. any idea what the strips of wood are for between the bricks?