Nope. HMD/S and TDLs are more of a RAM upgrade. If not for sanctions and budgetary limits, the PAF would've likely asked for both on the F-7PG from day one if possible.
The real question is whether today's HMD/S could work from the F-7PG's architecture or not. That depends on how the PAF is configuring the HMD/S for the JF-17.
If it's something akin to the Scorpion or Archer, then the F-7PG should be able to handle it. But if it's a projected display system like the Guardian II, then no, it wouldn't work.