I'll bet the Aussies are pretty resourceful, and they have lots of Italian espresso machine importers. If you're moving a bunch of stuff anyway, the Family might not be that much extra. Worst case you could have someone braze on a new male nipple like most current machines have, then get a replacement cap from one.
I have never used that Bezzera 49-mm spring lever group, but they are difficult to come by. If you really like the machine and the group design you may want to keep it because they are not readily available.
You could PM Paul in Christchurch NZ - I'll bet he might have info. on distribuotors, machines, etc. "down under"
Hand-ground, hand-pulled: "hands down.."