Thanks for the upvote, I have had a look at your post and it seems correct. There is a chance that exchanges will register and migrate the tokens for you but personally I would not rely on that. If they do it then it will likely be a few weeks after the mainnet is launched before you could withdraw the tokens.

Using or staking the tokens would probably be very difficult when they are on an exchange and they could rent out your tokens to the highest bidder and then not give you the profits