we need start stunnel on linux desktop by ordinary user (like on windows):
1 click stunnel icon on system menu
2 enter user certificate password
3 use opened tunnels with users applications
4 on desktop session ends close all tunnels

make XDG menu entry file:

[Desktop Entry]
Type=Application
Name=stunnel
Categories=Network;
GenericName=TLS/SSL - Port Wrapper
Comment[ru_RU]=Секретный туннель
Icon=stunnel

Exec=/usr/bin/stunnel

Terminal=true

X-KeepTerminal=true

but only problem is how stunnel react on signals: HUP is daemon's "reload config".
in X-session HUP signal is "session end" and stunnel is not exited on closing terminal or logout.

attached patch change this behavior:

if "foreground=yes" specified in stunnel.conf

HUP signal is treated as TERM and stunnel exited.

foreground=yes is "debug" or "desktop" mode of stunnel.

XDG-desktop file and icon file may be included in default stunnel distributions.