An easy solution seems to be to just tell the overlay to not be always on top. It still blocks the outlook window, but other windows can then be shown on top of it.

Creating a new entry with the name of an existing entry will override the existing entry without warning.

Note: one of my patches makes gpgpass freeze when changing the users that can decrypt a certain folder (might not always be reproducible). This is caused by a Qt bug fixed with https://codereview.qt-project.org/c/qt/qtbase/+/638159

If the password store root folder would be included in the tree, it would be possible to show all configured stores simultanously (e.g. with an additional name attribute in the store configuration). On the other hand, a conscious decision to switch the profile might be preferable to prevent user mistakes and over-the-shoulder information leaks.