The construction timeline of Type 054As is blurry and uncertain for a long time due to the COVID lockdown. I tried to make some verifications.
By now there were 13 vessles lauched including 4 Type 054AP for Pakistan Navy and 3 more vessles are under construction. Among these 8 were built in Hudong Shipyard (including all 4 APs) and 8 were built in Huangpu.
Rumor said that the 20 vessles contract of this batch was cut down to 12 and the rest vessles were turned to the new Type 054Bs.
And here they are: (Pennant numbers and names may be controversial):
If 054B is sticking with similar hull dimensions as 054A, 48 VLS is possible by lengthening the ship. But I don't think 054A hull is wide enough for two choppers unless PLAN is planning a major redesign.