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The prevailing opinion at this platform about Yugoslavia is that the lack of Perestroika couldn't prevent its dissolution because hints for fragmentation came quite clearly right after Tito's death 1980 and that therefore Perestroika only accelerated but didn't cause the process.
Now making the USSR cling to the old ways for another twenty years just by not having Gorbachev is one thing. Therefore this isn't an option. An earlier death of Tito would be so much easier.
So what if Tito died e.g. at some time between 1965 and 1970? Living long enough for international merits, but also longer time for the Yugoslavs to make shit hit the fan without any wind from Moscow?