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The scenario I have in mind for this is outlined below:
In 1940-41, Ethiopia is liberated from Italian occupation as she was IOTL but the issue of British visions for the Horn of Africa post-WWII cause conflict between London and Addis - the British wish to give the Ogaden to a Greater Somali state and separate Tigray from Ethiopia to establish a pan-Tigrayan state in Eritrea. However, pressure from the USA convinced the UK to abandon these idealistic dreams and allow for Ethiopia to reclaim the Ogaden in the early 1950s while receiving Eritrea in the 1960s.
What if London had decided to compromise with Ethiopia instead? In this scenario, Britain is willing to cede Eritrea in its entirety (with economic concessions and investment opportunities to London) to Ethiopian control but in return for Ethiopia ceding a chunk of the Ogaden to a future Greater Somalia that is currently under British administration. A particularly juicy part of the deal is having London abandon the special areas that came under their administration after the Liberation of Ethiopia and return them to the control of the Ethiopian government. Emperor Haile Selassie I finds this to be an irresistible deal and agrees to give up a chunk of the Ogaden to the British in return for what was promised above.
How plausible is this? What effects could there be on the Horn of Africa with earlier Ethiopian control of Eritrea and Somali control of (part of) the Ogaden?