Question, can H-E tokens be traded elsewhere already or is this a possibility for the future at all?
A few tokens that were originally on steem-engine before migrating after the Hive platform forked from Steemit have EOS counterparts that can be exchanged elsewhere. I am not privy to what Hive-Engine's plans are but their focus now is Web 3 and smart contracts so I would be surprised if in a few years atomic swaps weren't commonly available for H-E tokens to get BTC, ETH, et al. on decentralized exchanges.