I'm surprised the exchange didn't support the token swap or maybe the team from Dawn didn't asked them too?
Just keep the token as a memento.
...
And maybe someone is interested in collecting the original altcoin, the legacy altcoin that started everything in the future.
The only chance I see this happening is if the altcoin or its developers had done some great feat for the crypto community. That's highly unlikely to happen.
As I said elsewhere, Bittrex is famous for not caring about their users. And this has not changed in four years. I know this issue has happened to others because I have read their complains in reddit, telegram, etc. Some of them have asked Bittrex and received no answer. In fact, now Bittrex sends us an email and gives us five days to withdraw our coins because they are going to delete the wallet...