WTF?

I just found this and I'm trying to get my head around it all. Maybe after half a bottle of Vodka isn't the best time to be dealing with this.

Is this the only way to do this ?

I had the idea that once I'd taken off the exchange they were safe but it seems like that's not the case. What happens to them if I leave them in my offline wallet until June when they switch over to their own blockchain , do they disappear into the aether or does EOS get them back ?

I can't find any mention of any of this on eos.io.

Can I secure my EOS public and private key and register the public key to the Ethereum public address in the offline wallet I'm using now ?