Have you tried using MetaMask’s vault decryptor?
MetaMask may be able to help more since it seems specific to that extension.
By the way I believe profiles are the same as with Chromium, so you could technically try to copy it to a Chrome or Chromium profile. But just make backups if you are doing things at that level before you replace anything.
If you’d like to try an old Brave release there is also every Brave version here: https://github.com/brave/brave-browser/releases
Including for example 1.34.x releases.