Just fill it in, then just cut it back to give a nice edge to work to. I pack out 10mm to give a bit of tolerance, I might scrape it back to 5mm if the reveal needs it to get the margin right.
Get a piece of ply and cut a circle out to the required size with a router. Do the reveal first and the front when reveals are hard. I pack the ply 10 to 12mm off the wall.
You can get tennis elbow with any size trowel. I had it bad years ago, I had to wear the splints with the steel bar between velcro straps for 6 months. They stop you over turning you wrists. Plaster like a windmill and tennis elbow follows. I put on now with ox 18in, had tennis elbow with a 14in.
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