Putting up cornice on wide ceiling gaps

I've taken the old cornice off and there is now a 100mm gap between the wall and the ceiling - too much to cover with new cornice. I know I could lay narrow sheets of plaster or something else to fill the hole, but this will be a nightmare as all the spacers will be different (the old cornice was put up wet and the plaster poured in the fill the gaps), and I'll have a huge overhead plaster-joining job to do. Does anyone have a novel idea on how I might solve this pickle? I'll try get some photos if it's not quite clear what I'm talking about. Many thanks all.

Brett


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