I'd say it's impossible. Poloniex will start requiring web-cam verification for legacy accounts, where you need a webcam showing you holding up your passport. Unless you are into fake passports, I'd say it is impossible to get verified with a fake name.
If you don't want to disclose your real identity, trade on an exchange like livecoin, or on a decentralised exchange like openledger.
When we do talk about verification you might able to pass on earlier phase but now on updated ones it would really impossible.