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Okay, the question is how to avoid the Uprising/Revolution that (with considerable Western backing) created the First Hellenic Republic? And with this managed how does subsequent reforms/rebuilding of the Ottoman Empire go?
Earliest POD: 1718
+500 points: POD after 1770
+1000 points: Absolute Last Minute POD.
-1000 points: General purge of any confessional group beyond the village level, and that only if taken by storm after getting a chance to surrender.
+50 points for every 50 years after 1821 Greece continues to be governed from Constantinople (monarch not required, but no Ethnic/Confessional cleansing if the House of Osman steps down).
Something to consider is the degree to which the Phanariotes ran the Ottoman government by the early 1800s in OTL.