We have the opposite, we have the Subal port on Aquatica housing adapter, I don't know of one that would let Aquatica port on your Subal. There are some Zen domes manufactured for, and sold by Ryan and the Reef photo folks but I think they are on the heavy side also, have you checked with the Athena or Saga Dive people for third party solution?
Jose, from Saga Dive is not the cheapest solution , but really works hand-made
