This looks like a cool set-up!
I think the Malekko vca is out of production (at least the 4 HP version), so you would have to buy that one used.
An alternative could be to choose another quantizer, for example from Intellijel, Doepfer, or Topobrillo or the Penrose quantizer... lots of possibilities.
This way you could free some HP and then choose another Vca.
Anyways, seems like a cool set-up that will sound absolutely great!