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 Hive account@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.