Unless I've misunderstood the point of this network all together, there shouldn't be a case where we want the entire network address space to be reachable from the global internet. It's much more likely that the network will remain as autonomous as possible and any connections to the internet will be for connecting specific services through a gateway of some sort.
A subnet of at least /23 (typical minimum for global BGP announcements) should be reserved for the purpose of being globally routable in the future, if/when HamWAN decides to peer with one or more ISPs. An address in the /23 can be given to each service gateway for connecting to the internet.
The rest of the 44-net allocation can be treated as private address space, except that it's essentially guaranteed not to cause conflicts with the user-level networks since it's still globally unique.