Why not set up a system where each article proposed
for creation
exists as a separate page. And there could be a special page set up
which points to each of them. This special page could list the date
and time created, the name of the proposed page, the number of bytes
of the page, and the username or IP address of the proposer.
Surely that would be equivalent to just letting unregistered users
create pages again and having a Special page that simply lists all
articles that have only ever been edited by IPs.