I think the Ottomans would try to help the Muslims when the Majapahit declines.
It depends on the aftermath of Aceh being conquered by peak ATL Majapahit as well as to what becomes of Malacca after its fall as a battleground between Majapahit and Siamese prior to the Europeans. Can still see remnant Muslim communities existing ITTL though in a weaker position roughly paralleling to the OTL Blambangan kingdom.
The OTL period for Ottoman expeditions to the area lasted til the mid-16th century pre-Lepanto (as well as pre Portuguese victory in the Ottoman-Portuguese conflicts and War of the League of the Indies), the POD and resultant ATL providing little opportunities for the Ottomans to intervene due to the conflicts in the area and Majapahit's hegemony likely still being relatively intact, not to mention the latter's ties with European powers.
Additionally Majapahit's ATL post-Ming decline and fall in the late-17th century would only be about 2 decades before the Ottoman's own OTL stagnation beginning in the 18th century. There is the Omani Empire however their focus seemed to be along East Africa up to Gwadar in present day Pakistan.