It depends on the size of the ballistic missile. It can be as compact as the SY-400 -- i.e., a variant of the CM400AKG. If the JF-17 can carry the CM400AKG, then the Type 054A/P could possibly carry the SY-400. This is the SY-400. It could potentially fit in an existing VLS -- the HQ-16 has a length of 5.2 m, the SY-400 a length of 5.1 m.
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Anyways, a more general point, let's keep things relatively realistic based on the actual info available. Until the PN says so, the Type 055 -- or any true destroyer -- isn't on the cards.
If the CNS can clearly confirm to us that the Jinnah-class is separate from the 4 MILGEMs, then I am sure he'd clearly tell us a destroyer was on the cards.
There's no reason for him to be cryptic to the extent of continuing a point about the Yarmouk-class with a subtle comment about a destroyer the Chinese didn't even clear for export.