Hey, a bit of a long shot here.

I have an external usb disk that is fully encrypted by Veracrypt. I would like this disk to decrypt and mount when plugged in. Yes, I already know how to do this by using a udev rule to trigger a systemd service that calls cryptsetup to unlock the drive once plugged in (and unmount/lock it back once the service exits). But this approach requires me to manually stop the service via root shell to trigger unmounting and closing of the dm-crypt device before I can safely remove the disk. Is there an easier way to perform this action via the desktop or file manager?

For example, Thunar file manager normally shows a list of external devices that, when right-clicked, offer an option to "unmount" or "eject" the device. Is there a way to have my disk added to this list, so that whenever "eject" is selected it will run some custom command in background? It would be sufficient to have the systemd services stopped, as they will perform the necessary cleanup.

Ideas? I'm using Xubuntu 22.04.

I typically have a ~/Documents/Scripts directory. Sometimes I upgrade multiple installed Operating Systems from one on a multi-boot by clicking on the menu item.

I create a "updater.desktop" and put it in ~/.local/share/applications. For KDE it kicks off a up.sh script that launches Konsole asking for root password, then executes the updater.sh script after the password. up.sh:
The updater mounts other OS partitions, chroot in and apply updates, unmount etc. All by clicking on a menu item with a snazzy icon of my choosing.

EDIT: I usually browse the /usr/share/applications directory to find an existing .desktop that suits my needs, make a copy and edit it's name, point to my script, change the icon etc,

Yeah, using shortcuts could work, but my question was more in the integration direction.
What program does xfce use to handle mounts in the /media folder?
And can custom devices from /dev/mapper/ be added to the list in some way?
The system seems to detect external usb block devices, but not the device mapper devices.

Those seem like the sort of questions you might do better with asking on Xfce forums.

(If you do, please come back and update this thread.)