Back when Keychain advented I managed to get it to work on Brave, with consultations from wise, aged coding veterans. Because of the difficulty getting it to work, and the fact I once mistakenly published my active key and had been briefly hacked before I managed to change my keys and reclaim my account, losing only 400 Hive I had unstaked for ready use, I have since stuck with Brave and Keychain to secure and maintain my continuous access to my account. The recent departure of @erhgermany because of issues with her keys has been a cautionary tale. She could not change her keys, had not setup a recovery account, and the default recovery account when Keychain was made available was Steemit, whom would not help her after her migration to Hive.
Damn this is new to me. Thanks for sharing!