Today I have installed ZorinOS16.1 on my laptop. Therefore it was a Windows machine and I used Keepass together with Kee for integration with Brave. It worked all fine.
Since there is no Keepass for Linux I have to use KeepassXC that also can use Keepass DB and Key. There also a option for browser integration but I have to install an extention called KeepassXC for Chrome. To bad this extention doesn't work and I receive the error "key exchange was not successful" Nomatter what I do I can't get it to work. I also used the SNAP-package with a bash-script called "KeePassXC-Browser Helper Script" but no succes.
Now I'm looking for an alternative for Keepass and KeepassXC that has a browserintegration and can compatible with Keepass db and key-file.
I don't think you'll find something that is compatible with Keepass db and the key-file, others will be using and built differently than using another companies.
I'm using Bitwarden and it's been working fine for me. I think you may have to switch programs completely rather than trying to use a bit of this and that. I can't see doing it that is good security wise either.