WI Evolution of Greater Bosnia if the Ottomans keep Croatia and pacify Hungary as a vassal

How would Bosnia develop if it keep this borders:
Bosanski_pa%C5%A1aluk_1600._godine.png

Plus those two sandzaks between the Sava and the Drava rivers? Ideally helping a protestant vassal hungary to take the rest of the hungarian planes and the Habsburg Croatia would give Bosnian borders a christian buffer to keep war away from them and thus avoinding the constant demographical drain they suffer in otl thanks to Habsburg-Ottoman wars.
Of course, the ottomans showed problems controlling the hungarian basin in the long term but Slavonia had some mountainn systems that could aid in its defense:
Croatia_topo.jpg

And after the initial ottoman conquest the whole region was demographically devastated being considered almost empty after most of the population left to become refugees in Habsburg land, could the region see more muslim immigration if the ottomans keep it for longer and avoid wars getting to those regions? Of course if the ottomans collapse anyway later but keep all these territories longer there may be more bosnian and balakan muslims in general in the region.
 
An evenly divided population between Serbs (Orthodox) and Croats (Catholics). Might be good to play them off against each other. However, problematic if the Austrians keep fight the Ottomans. Even after 1815 it is still possible.

Bosnia needs more than land to develop, for one a dominant Bosnian (muslim) Population. Preferably more than two third. Which isn't hard if the Ottomans actually pressured conversion to Islam.
 
An evenly divided population between Serbs (Orthodox) and Croats (Catholics). Might be good to play them off against each other. However, problematic if the Austrians keep fight the Ottomans. Even after 1815 it is still possible.

Bosnia needs more than land to develop, for one a dominant Bosnian (muslim) Population. Preferably more than two third. Which isn't hard if the Ottomans actually pressured conversion to Islam.
Could those mountain systems in slavonia help to defend those lands and its populations? It seems the type of warfare the Habsburbs and the Ottomans developed in the Hungarian plains and parts of bosnia and serbia was quite awful to the long term developing of the region, since they traded lots of land during armies advaces and the populatios was forced to run away (and sometimes also forcefully displaced). A more peaceful border seems necessary for the developing of the western ottoman balkans, specially Bosnia and Slavonia, could the river systems of the plains (sava, drava, danube, etc.) be used by some kind of special ottoman river fleet specialised in supply of river forts and armies and accelerate army deployment and movilization in case of war or rebelion?
 
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