Anyway you could prevent the European powers from intervening in Greece
What would this mean for the Greek Revolution
Alexander I lives just a few years longer. Or maybe Constantine takes the throne rather than Nicholas. The Greek revolution is crushed, Ibrahim Pasha is the governor of Morea and Crete. Large scale purges of rebels. Some kind of resettlement with Egyptians to create a loyalist power base. Not too much to overcome the local Greeks.
Depending on if Mahmud II and Mehmed Ali Pasha fight again will decide when a second rebellion can occur. If Ibrahim Pasha can keep the Greeks happy with average taxes then a rebellion is delayed or prevented in the future. Another thing to consider is Serbia. It was autonomous until 1830 when it pretty much became semi independent as Russia demanded. No Russo-Turkish War in 1828-1829 means Mahmud II can try to reintegrate Serbia. But that has to happen before Nicholas takes over as Nicholas will use it as a pretext for war. And I don't know how long an ill Alexander I can live longer than his life being extended. to 1829 or so.
Pro:
- no Southern threat for the Ottomans with an independent Greece
- Ibrahim Pasha away from Egypt, can't help his father in the Middle East
Con:
- Mehmed Ali Pasha pretty much dominates the Ottoman Part of the Mediterranean. A future rebellion is more dangerous than OTL
- In a conflict between Mahmud II and Mehmed Ali Pasha, Ibrahim Pasha can stir up the Greeks like Ali Tepelene did as the risk of losing Morea is likely. A double front war has huge consequences