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To solve a similar problem (plasterboard butting up not very flush to an aluminium frame), I used angled pine moulding / beading.
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NotThamesWater
I'll post some more pics as I'm struggling to work out your suggestion.
The issue is the frame is wood and you can't plaster on top of it.
Here is a birds eye view of the issue.
At the moment the wood frame is flush. But after the skim it'll be too low.