Easiest way to set up 5 RAF accounts?

[beeq]

Ok this might seem stupid question, since my first team have achieved nice things for a few months already, but I remember I had troubles with setting the team up, or actually setting RAF up.

All I had was my main account and then I invited 4 trials (same e-mail than main) via RAF.
I linked all slave accounts to main account (A<->B, A<->C, A<->D, A<->E), so no chaining there.

Started leveling, and at lvl 20ish, I had to upgrade trial accounts to Vanilla.

Upgraded accounts B C and D via Digital Purchase, paid with my Visa.
Had troubles upgrading account E (error #203), since I had 3x covering funds taken from my bank account, and the 4th didn't complete until few days (suspicious transfers bla bla). However my bank said there's nothing blocking transfers..

Since Battle.net account currently can handle only 8 game accounts, and I need 10, I decided to make new Battle.net account with 5 game accounts to it linked the same way than on my another team.

My question: Is there easier way to do this? If I buy 5 Vanilla retails, can I still link them together, or do I really have to soil my hands to this 4 trials-account upgrade fails-crap again? :P

Thanks in advance!