Ok, so I finally got a call from Kathy. After more than a week of trying, that's all I ever wanted, just to talk to someone at the bank who can actually do things.
Kathy set me up with Bank-to-bank transfers between my IAFCU account and my checking account at my other bank.
So, finally, I was able to log into my IAFCU account and initiate a transfer of funds into my regular bank!!
However, based on how everything else related to this goddam Bitfloor refund has gone, I will not assume it will process properly and I fully expect to have to open a new issue in just a few days.