Oh and lets not forget about board size, the commercial is interested to have it small as it pays for it, the DIY the extra board space costs next to nothing and so diy is better off with something big enough to fit everything with big clearance and having extra space.
Anyway, you see all i said is coz i dont think you are stuck at routing, i think you need to decide which way to go between the above.
Btw, I am also trying to make and document some generic electronics, also in kicad, but i took the full DIY route, and this kinda makes many decisions to fall back to this one. At routing for example i have something like like 1.5mm min track width and 0.5mm min clearance, and many other choices fall back to this.
Anyway, you see all i said is coz i dont think you are stuck at routing, i think you need to decide which way to go between the above.
Btw, I am also trying to make and document some generic electronics, also in kicad, but i took the full DIY route, and this kinda makes many decisions to fall back to this one. At routing for example i have something like like 1.5mm min track width and 0.5mm min clearance, and many other choices fall back to this.