Expanding my possibilities
Well, after a few days without soldering, KiCad and even the Apple IIgs, I thought is was time to drag myself upstairs and sit behind my desk.
I took another card, cut the traces I did before (to fix my f***-ups) and fired up KiCad. In order to be able to use the /DEVSEL signal in my design, I had to cut a third trace, which happens to be on U6, pin #19, which happens to be the /CE pin. I am going to use 74HCT27 tripple input NOR gate to combine the signals /IOSEL, /DEVSEL and /IOSTROBE to trigger the /CE of the 74HCT245.