Although some sources claimed that Bem was appointed governor to Aleppo, this was very unlikely. However, he's still treated with respect, as most Ottomans had already knows his fame and unquestioning loyalty to the Ottoman Empire after his escape. Repeatedly Bem petitioned the Porte to employ him to active service in the Crimean War so he could fight the Russians again, but the Porte refused due to Austrian and Russian pressure and promised to employ him after 'things quietened down'. He however, was appointed as the Ferik (Army Commander) in Aleppo and plied the Porte with building projects like a gunpowder works in Aleppo. In his service he defended the city against revolts and Druze attacks, where he died fighting the latter

Most Ottoman higher-ups in that era (mid 19th century) actually received European refugees well, as one of the main aims of the Ottoman state after the Tanzimat reforms was to appear as a member of the "civilized powers”, and one way to appear so is to accept romantic refugees, even more so as the refugees were supported by Britain and France. Most of these refugees were later converted without pressure, as the public treaty with Austria and Russia requires refugees to convert to Islam lest they will be returned. Ottoman officials at first feared that fights will broke out between the converted migrants and Ottoman citizens, but as far as i know, no such fights occured

Sources are from The Ottoman Crimean War and Conversion and Apostasy in Late Ottoman Empire