They didCould the Ottomans decide to encourage large scale conversions in the Balkans to Islam following the Greek war of independence
Would kind of persuasion would be best
How much of the Balkans could they convert to Islam post 1831
Of course, conversion to Islam is no guarantee that the population will continue to identify with the Ottoman state. Just as an example, Albania was majority muslim, and had provided a disproportionate number of soldiers and officials to Istanbul over the centuries, and yet, when the Balkan Wars came, they chose to jump ship and declare independence. A common religion cannot substitute for a lack of other common interests.