I ordered the g403 and gpro saturday, with all the promos from the german logitech webshop, got tracking for gpro monday and received the gpro tuesday. (the Netherlands) No sign of the G403 yet.
I cut the leds and removed the dpi button, and with a precision knife I carefully removed the mousefeet grooves and the circular mousefoot entirely. (I use a hard pad)
Finally, I put a paracord cable on it, it's ~80 grams on my scale and it feels amazing