Certainly it is possible from a technique point of view; to enable a student to be mentally/psychologically prepared to defend him/herself is certainly possible as well. The critical thing in that aspect is for the student to learn confidence in himself and in the effectiveness of the technique.
As for techniques; I agree with the others. Short; quick, simple moves such as:
> Nikkyo (my personal favourite
), Katate-tori and katate-kosa-tori variations; static and dynamic.
> Sankyo, mune-tsuki, yokomenuchi and shomenuchi variations.
> Udi-kiri-oroshi (Ridiculously easy; devilishly effective)
> DEFINITELY tae-sabaki, and lots of it.
> Dunno what it's called; but I find it nifty and effective in randori: Starts off like a kaiten-nage, then once you have uke bent over; switch to a sort of udi-kiri (hands at wrist and elbow)and drop him to the floor in the path of the next uke. (Dunno if that one has a name; but I'd teach it; if only to sponsor the creative thinking necessary for good self-defence.)
...And lots and lots of hitori-waza and Randori.
Interesting topic, Peter; thanx!