I like the 3 for the 'ayn (since it's the same shape, only backwards). My Darija is poor, what's the 9 standing in for in "fe9t"? Is the 7 in "wa7d" a ح ?
Ah, qaaf, that totally makes sense (same shape again, I guess you could say the same for faaf too, but since the sounds are the same 'f' works fine already).
9 is for ق