If you're critically low on gear, CT will not only give you some 80 to fill the gaps, it will also give you 150 Myth per run, allowing you to more easily make that jump to the Myth gear.

I'd say go for it. You don't have to worry about Accuracy until you challenge the Binding Coil of Bahamut, and you'll have Myth pieces that give you enough accuracy by the time you're ready to do it.