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Britain wasn't too into giving Eritrea to Ethiopia.
Britain also was for swapping the Haud (a triangle-shaped territory of grazing lands south of British Somaliland).
OTL Britain contemplated handing South Sudan to Uganda.
So here's a thought:
Eritrea becomes independent instead of becoming part of Ethiopia
Britain swaps Zeila for the haud
Ethiopia settles the boundary dispute with Italian Somaliland in Italian Somaliland's favor