I believe that things are in the works to allow up to 32 VLAN-PKEY interfaces although I don't have the exact timeline when this will be made available.
Multiple PKEY to VLAN mapping will be supported probably early next year on the SX6036. We don't have exact numbers available but likely 32.
The 4036E supports 64 VLAN to PKEY maps, 32 while in HA mode. Please let us know if you have any more questions.