Blizzard customer support has both moved accounts off of a single B.Net, each onto their own B.Net.
And then a few months later, they helped me move accounts onto two B.Net emails, so I had five per B.Net.

If you own each of the accounts, your own name, etc... Blizzard will let you move them, each onto their own B.Net; their customer support is good in this regard.
Then you're not limited to 36 Tokens per 24 months on one B.Net only, but on each of however many B.Net emails you end up with.