just buy the sor account, merge it to your battle.net, then apply the level 80 buff and transfer the character immediatly to your primary account.
When they ban the sor account, it doesnt matter. I've done this twice, each time they've banned the sor account, but i've kept the lvl 80 character i transferred to my primary account before the ban, which continues to work just fine.
So spend about 40 dollars for a level 80? Bit much don't you think?