Any plans by AxCrypt to fill this new niche?
It’s not a niche.
You’ve got dozens of password managers – the following are all free and open source:
Commercially you got 1Password, LastPass, Bitwarden, Dashlane, RoboForm and dozens more.
To answer your question, I believe a desktop version is in the offing but it’s not intended to be a proper password manager nor does it have the security associated with a fully-fledged password manager. It’s a convenience feature.