I want to do a experiment in grafting pachanoi on opuntia. I haven't seen this before so i ask if some of you know or even did this on your grafting stock.

Is it possible to cut a rib longitudinal from a pachanoi and stick it to a opuntia? To better explain myself i made a drawing.

Is is necessary that the pachanoi portion has the core too? Or is it enough that the rib contains areoles?  I ask this because i now it is possible to graft areoles.. so no central woody section is necessary. Or is it? I never saw this being attempted but in theory it might be possible.