Sorry, but that is a silly notion. The Magyars entered Europe in the 8th or 9th c. when they crossed the Ural. The Bulgars may have been in Europe, especially the Pontic Steppes, for much longer, but they settled along the Lower Danube in the 7th century.
Osman announced the independence of his own small, "Ottoman", kingdom from the Seljuks in 1299. Even ignoring the Magyars, the non-presence of an Bulgarian state directly on Constantinople's doorsteps will change the History of the Eastern Roman Empire beyond all recognition. You cannot even claim that any polity of Oghuz Turkic-Speakers will occupy Asia Minor.
And since by your OP the Magyars and Bulgars do not simple disappear, they and their descendants will happily mix up anything we know about the history of the steppes. You have butterflied away Genghis Khan and his descendants as well, and with him nearly all of OTL's history of China, India, Russia and Persia after 1300-1500.
Some Turks will probably move westward and stay there, but which branch they will be (Kypchak?) and if they go mainly north of the Black Sea instead of south is completely unknowable.
Insisting on Ottomans under this circumstances sounds a lot like asking: "Well, if a revengeful Tarquinius Superbus had completely destroyed the city of Rome - whom would President Washington compare himself to instead of Cincinnatus?"