My current understanding of RAF and multiboxing

[Wag]

Hello! I have a RAF situation that I was hoping could be confirmed by some experts.

My goal is to 5box. I want to have 5 accounts with each class at 60 by the time my RAF links expire.

Understanding my situation:
I have an 80 pally. No new chars will be created on this account. The pally will be used for boosting only.
I am going to purchase 5 new accounts.
Before I get into too much detail I would like to explain the way I will link and purchase these accounts.
80Pally ->Account A ->Account B ->Account C ->Account D ->Account E
That should get me 5 free months. The only account to not get a free month would be E.
Q) Is this the smartest way to do it?

The problem / confusing part:
I can only have 5 players in a party so the best I can do is 4 toons to 60 at a time.
This creates a problem, one account will be left alone getting no progress with characters.
That is the part I need help on. What would be the most efficient way to do this?