When running KDE on a Linux system there is a plasma-vault tool to allow easily creating encrypted directories using various encryption backends. Sadly it seems that plasma-vault is missing from the FreeBSD repos, including the latest repos.
Has anyone tried to build this for FreeBSD?
Only one person is engaged in porting KDE to FreeBSD. In my opinion, you want too much from him. This is a titanic work. It would be better to help him somehow.