As nothing would be perfect, perhaps consider requiring all and each member wanting to post on ET to re-register according to details on credit cards, probably charging a minimum fee (say USD1.00) once off. No re-registration is required if no posting.
Oddie. Nice try. I have more credit cards than I have aliases, with nearly as many name variations: John Merchant J. Merchant John Xavier Merchant J.X. Merchant Xavier Merchant John X. Merchant J. Xavier Merchant
Of course you are allowed to do that for multiple aliases, however others would know that easily, as the first three digits of card number and the initials of firstname and surname could be displayed.
More credit cards basically would cost more annual fees. Therefore, hopefully the total number of aliases owned by a single person would be still limited by this critical variable. As if someone has multiple (sur)names, then (s)he probably could do many things (s)he likes and plans to do, and why spend much time on ET?
Odd. I like ET because I work 12+ hours a day 7 days a week for weeks on end. ET is like fat pussy: it is the cheapest entertainment to be found anywhere late at night. And when I am testing and modifying code in slo-mo overnight tick time, like tonight, it is a welcome diversion. I mean, at my age I can only get it off a couple of times, but I can read ET all night.