Dr88, this trick is very feasible on a clone. As long as it's a fast action. (I wouldn't be inspired to play those rhythmic chords on a weighted piano-type action.) Even better if it triggers high and not at the bottom of the key travel.
It also sounds great on Clavinet or other simple, fast action keyboards.
You could start by playing the same chord an octave apart. If it sounds too full in the left hand, just drop one of the notes.
Bfields, regarding the order in which the harmonics trigger, on my four Hammonds no two notes are exactly the same although there are certain patterns.
(As a side note, about a year ago in a thread on this topic, I threw around the idea that a clone with three -assignable-contacts per key would be enough to realistically emulate the nine contacts for the most usual drawbar settings. And now, lo and behold, the XK5 with its three virtual contacts. (Where's the tinfoil hat emoticon?!))