I oppose idea of open recruitment because what pervents old player from creating new account to spy... It would just encoumber admins to check every account to see is it double or not and that way it would slow development of the game... As far as other idea I don't know every guild can be training or pirate or privateer etc.
What I would propose instead of this is that Avonmora Herald is created for the new players and each guild can apply to admins then that guild is there and it is showed all the time like quartermaster page at least till they don't spend 1000 turns.
Like for example we in SSTG decide that we want 10 new players this month we contact admin and say that then admin makes a list like this:
Curnently recruiting:
Helm 15 players
SSAA 13 players
SSTG 10 players
Ayes 5 players
And so on that list is updated monthly and with each approved application list changes it could be some work but it shouldn't be too complicated.
Others still can apply and be approved or not but this way new player would end up in ctive guild with people to help and ask...
This way guilds keep autonomy over their members but new players have list where they can find place to call home