Hello. PC Move is a one time transfer. Once you've transferred your battle.net account to your Steam account, you're stuck with that Steam account.
You will either have to play D2 using the account you transferred your data to, or start from scratch on the Steam account you originally were supposed to use.
If you have another battle.net account, you can use that to transfer to another Steam account that has not been used yet for transfer.
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Yikes, that's rough, I think I'll make a dummy steam account then. Thank you for the help, man!