Unfortunately, once a successful Migration has occurred, the two accounts are locked together.
You cannot re-use a Battle.net account to Migrate to a different Steam account, nor can a Steam account be used for a different Battle.net account's transfer.
If you wish to access your PC save data, you'll need to log in using the Steam ID that you set up for the Migration; it will not be able to be Migrated to a different Steam ID, nor can it be transferred from one Steam ID to a different Steam ID.
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Well, I guess it was fun to play this game while it lasted. Thanks for the answer.