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aav is fine and not only for the secondry stack. Look at EN12056-2 En12380 it states that only 1 in 10 stacks have to be open to atmosphere. The O2 in london doesnt have 1 roof penetration and is vented elsewhere.

Its not a softner is doesnt removel the hardness just turns gives all the scale the same charge, remember school magnets like poles repell. it would work okay for instant heaters, but after a short period the scale will revert back and stick together again and build up. If you want soft water...

Just seen where you are located. Contact Studor Australia

Sounds like you need a 2 way vent you can tee a Maxi-Filtra on to the soil pipe check out HummBusters on the internet.