Based on the images shown in the link below, I think the PointOneGrind should fit the Porlex mini. The mechanism looks identical to the standard Porlex in the PointOneGrind installation video.
That being said, I have never tried it with the mini so it's not guaranteed.
Porlex Mini grinder review: http://m.youtube.com/watch?v=qGVxzHXAexw
I hope this helps.