I didn't see this posted yet, but excuse me if it was.
If you have 2 accounts that you own, and you only have BC installed on one of them, you can still transfer the chars. I tried it at first and it will say target account isn't a burning crusade account. But they released a 10 day free trial of burning crusade. Just update your non-BC to the BC trial and it will let you transfer. I didn't try transferring my blood elf, only a troll. I'm thinking you could transfer a blood elf, but I'm not sure if they will disable the blood elf after the 10 day trial or not.
I also only tried this with a char under 60. But it may be possible to transfer the level 70 to the non-BC account as well.
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