@mlpinvestor
I'd recommend just printing and mailing the return. I suggested the method you mentioned (initially) but I really don't believe it will get to the IRS; the attachment process appears to be strictly for the transmittal (8453-FE).
Note that if all of the transactions on the 1099-B are covered, you really do not need to send in your 1099-B at all (the IRS will request it after you e-file if they need it for some reason).
