Unfortunately, it doesn’t appear to be possible, and it has been that way for many months. This American exchange hasn’t been fair to NuShare and NuBit users on a number of occasions, we can agree.
There are still a large number of NSR on deposit at Poloniex that can’t be removed (from anecdotal reports I would guess at least 150 million). Liquidity Operations cares, and we have even offered Poloniex $1000 to enable withdrawals. They did not respond. Esko sends correspondence to them periodically about it, but I believe they generally ignore it. @jooize what was the last correspondence you received from Poloniex?
We are open to suggestion about how to proceed, but Poloniex gets to make all the decisions on this. There is little we can do but ask and create incentives.
It might be worth considering how they would respond to legal action or the threat of legal action.