I had similar thoughts the other day, but I think there is a relatively easy way to realize this: sythetix.io creates synthetic assets, which are not linked to oracles on chainlink. The minted synthetic tokens mirror the price development of the original assets but are ERC 20 tokens, so they can be used on uniswap etc. They have these for various crypto currencies, which run on other chains such as BTC, EOS etc. I am not sure what is necessary to get Hive integrated there, but I guess this would be a relatively easy way without any full integration on witness level.