I don't even have a nextcloud, i just keep my database on a single folder sync across my tablet and phone, if you could set up the nextcloud to sync in rhat same folder you (theorically) would have no problems 🤔
I mean that's what I had been doing. The issue was just that the background sync of the nextcloud app on android wasn't reliable enough and KeepassDX had no mechanisms to check for external changes before overwriting
Then i can't help you, Use whatever works and it's trustworthy enough for you, just don't be surprised and come crying if Bitwarden SOMEHOW gets a security breach.
As I said, I like KeepassDX better as well. But the feature it is missing is critical for me unfortunately. I don't know why you think Keepass2Android is not updated though, the last release was 3 months ago.