I will tomorrow once again call the contact support at AESDirect. I was on hold for a long time today but got a few questions answered. I
think in this case where you are acting on your own behalf, you are the USPPI. The one thing you have to do is get an EIN from the IRS. See here:
http://aesdirect.census.gov/ein_help.html
Individuals applying for an EIN may do so under the Sole Proprietor category, even if they are not starting a business. The EIN will only be used for government reporting purposes unless it is assigned for one of the reasons mentioned above. It can easily be obtained free of charge from the IRS by applying online, by fax, postal service, or by calling the IRS toll-free on (800) 829-4933. For purposes of registering or filing in the AES or AESDirect, a resident of the United States must use its EIN for identification purposes and the information entered into AES or AESDirect is not disclosed to the IRS.
I started to get the EIN, but then hesitated as I wasn't sure which category to request that under. Apparently this addresses that. You still have to pass the quiz I guess. Likely tougher than getting job with these folks, but you can take it as many times as you need to pass.
There is a User Guide available to study for this quiz, available here:
http://aesdirect.census.gov/support/userguide.html