Great vid Fenril. With a bit more digging I think I got it figured out what I will do.

1. Have 6 separate Battle.net accounts (thanks Fen, I don't want to wait to log in)
2. Link accounts like so:

/----->--C----->--F
Account A|------->B
(existing with boosters) \----->--D----->--E


Then I will boost accounts C, D, E, and F with my hunter, and since my hunter isn't directly linked to any of those accounts I will still get the 3X exp boost... I think.

3. Get to 60 on the 4 characters quickly and boost the 5th
4. Profit