Nice concert story!
FYI - The second British LP is most similar to Rolling Stones Now US release -
http://en.wikipedia.org/wiki/The_Rolling_Stones_No._2
There's an Australian pressing called The Unstoppable Stones that has some of the '64 Chess tracks in true stereo - I've only heard digital copies but they sounded great. Looks like there were some other releases of those tracks per the SH forum.
12 x 5 was partially based on the UK 5x5 EP. With both, the usual US vs. UK track shuffling applied.