So I set up some secondary accounts when the game rules were changed to allow me to do so via IP sharing, and now I will lose them.
That's your own fault. The legal multis were never meant "to be set up specifically" but to make sure you do not need to delete accounts after the first merges.
If you go and create extra accounts to play with yourself and aid yourself, that's on you, sorry.
And because I knew that would happen I voted against the legal multis back then. Unfortunately I was overruled.
One player, one account (per server). That's how it should be.
Will players with PL Kerberos accounts have to deal with players from PL Beta? Will there be a restriction on account transfers (i.e. a beta player cannot transfer an account to Orpheus)?
The target servers are clearly stated in the announcements.