You can transfere to c-cex. There is no need to enter the "message" Same to drachmea. In my case it took 30min to get the tokens to c-cex.
You only cannot transfere the tokens back to bittrex. They ask for the "message" if you want to deposit draco in bittrex wallet.
In c-cex you will not get the "message" generated so you cant transfer back.
So probably you would pass the " last draco pump" in bittrex when you transfer to early :-)
I just moved my jio back to c-cex (moved it away when they threatened delist a while back) and moved draco to c-cex. nice and easy.You only cannot transfere the tokens back to bittrex. They ask for the "message" if you want to deposit draco in bittrex wallet.
In c-cex you will not get the "message" generated so you cant transfer back.
So probably you would pass the " last draco pump" in bittrex when you transfer to early :-)
if you want to get it back to bittrex and need a message sent, you can use a nxt online wallet (i just used https://nxt.jelurida.com/index.html ) though i dont know how secure it is, it did work as planned.
send from c-cex to web wallet, send from webwallet to bittrex with message
you'll need a nxt or two in the webwallet to send the draco or jio back out. 
