Sorry for dredging this up from the depths... So I see that http://trac.sagemath.org/ticket/14418 has a more explicit interface. What gets me wondering about the current state in Sage is an article in the most recent Notices which contains a reference to https://sites.google.com/site/grassmannalgebra/thegrassmannalgebrabook which has a fairly fully-featured (apparently) computational set of Mma extensions for all sorts of Grassmann algebra types - including the "internal product" and "regressive product". Just putting this out there in case anyone knows anything about it - or even the author, in the event that it were possible to just "port" things to Sage.
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