So, for the moment, anyway, I have inserted AppleTalkPort into the class hierarchy between Port and EtherTalkPort/LocalTalkPort. Only change that should be required to your router configuration is to change
to
and suchlike.
from tashrouter.port.localtalk.tashtalk import TashTalkPortto
from tashrouter.port.appletalk.localtalk.tashtalk import TashTalkPortand suchlike.

