Since you're trying to reduce the base kit due to Alice inclusion, I suggest move numpad to a child kit, then you can bring some accents to the base like that attractive 6.25u purple spacebar and possibly add 3 basic 40s keys.
Also, there's a problem with the 2 mini space bars in base, those don't seem to match 2.25 and 2.75u.
I'm still hoping you can add 3 more new novelties for R4 to place in Control/Alt/System.