What is the end goal? 5 box with mixed team(s)? You can link 2,3,4 and boost the teams with the 80. As long as the alts stay near the same level they will get the 3x exp.
To get some new toons on the account; start now with 2 new alts and boost those, as many as you need and then when the month is up you can then link 2 more alts but this time link to old toons.
In 6 months time you will have 50 toons at level 80. Sounds like a long time but think about the best times to 60 now is about 12 hours played. 60-80 is another week or so.

Depending on how much time per day you play, you can have 10 at level 60 in 60 hours or 2 weeks playing RAF 4 hours a day. It does take slightly longer playing 5 at a time but not much. Next month start on 2nd group and level 3 at a time, using one of the new 60 to help.