You are correct, AL no longer uses the 8453. The AL DOR is pretty easy to work with so I would recommend filing electronically. If they send you a letter, you can reply with whatever they want. They process replies quickly and I would not expect you to have an issue dealing with the AL DOR.
The MAT (My Alabama Taxes) has a document on uploading to MAT. I do not know the limitations of the system.
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