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This can easily be done via Hive-Engine.

How to convert STEEM to HIVE using Hive Engine

I found this walkthrough just quickly Googling, but I'm sure there is a more up to date, clear walkthrough if you search a bit deeper.

Posted Using LeoFinance Beta

I use this too but a proper bridge is something different. It would allow Steem Engine coins to convert to Hive Engine coins seamlessly.

Posted Using LeoFinance Beta