Derailing the Ausgleich would be an idea FJ would have liked. Especially if a short victorius war strengthens the central gvmt. Going back to pre 1866 would not be possible, but reversing it a bit - yes.
A "short victorious war"? It will be short, what with all its neighbours piling on Austria, not to mention the Hungarian government recalling its regiments (even a thick-headed reactionary like FJ should be able to experience a deja vu), but the idea that Austria can conjure a victory out of thin air is ludicrous.
BTW, the Ausgleich was a painful compromise that allowed the last Habsburg emperor to gain an extension of the lease