Subject To (Sub2) - Issue with online access to seller's mortgage

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Im on my 7th Subject To deal and came across an issue. In my previous deals i required sellers to change the username and allow me to reset the security questions/password for their online account access for their mortgage lenders, ensuring only i had access to the account from closing on; however, those previous deals involved mortgages from lenders separate from the seller's primary financial institution.

I ran into a hiccup on a great deal im about to close on, and i'm guessing i'm just lucky i haven't had to deal with it yet. The seller's mortgage lender is also the seller's primary financial institution; therefore, allowing me access to the mortgage information allows me access to the sellers checking/saving etc. The seller obviously does not want to allow this, and I don't blame him one bit, as neither would I. Just changing the mailing address won't work, as it will screw up their mail, and cause unnecessary grief with their financial dealings.

Any Subject To experts have a work around for this?