Nice! Will do that 
Let’s call it dab, if I can.
Mission complete!
NB: On lInux the (hidden) file is named “.gmic” and is located in the user’s home folder.
BTW forget my request it was not related to this viewer : I launched Paper Cuts in the standalone version of Gmic-Qt and it just displayed 40 layers after completion. So having a shortcut for blend alpha in your viewer wouldn’t help in that case.