Is this the fastest way to uninstall an HPKG?
First, search for it from the Deskbar

When it comes up as a search result, just double-click it. If you have multiple copies of the file on your system, e.g. there is another one in your downloads folder, it doesn't even matter if you selected the one in /boot/system/packages. Any one will do.

Almost done. Now just click on the Uninstall button in the top right corner.

Done.