Okay answering back for anyone.
From another subshell, to focus Geany and reload the config automagically.
`wmctrl -xa Geany && xdotool key Super+space alt+t KP_Enter`
Now my little workaround works perfect!
I have no idea how to create a Geany plugin otherwise, while not knowing anything about C/C++, i always find my way quickly with php and took me no more than 2-3 hours to create it. ;)
I would be glad to share.