I've looked into a couple of different propagation methods using the tissue culture idea,
one way has similarities to what I'd call standard cloning (with a smaller sample) but we'd be using an agar gel as the media manipulated to encourage rooting or vegetation depending on the desired outcome.
The other is by callus initiation (which can be an exceedingly small sample). Similar thing but the time scales are longer and starting with culturing undifferentiated cells where there is a multiplication stage. http://www.biologydiscussion.com/tissue-cultures/stages/conditions-and-stages-of-tissue-culture-with-diagram/15697
In both cases, optimally I believe, we'd probably be looking for growth tips as samples which could have the additional benefit of possibly eliminating any unexpected plant virii.
I need to refresh my memory overall on the techniques and protocols (from the journals) and maybe we could start a discussion on the general techniques and whether this could be beneficial, any risks, etc.