I have downloaded the solitaire expansion. If I'm reading this right, the solitaire event cards are not discarded when used. They are reshuffled into the deck, so that each draw is a 1 in 12 chance? This would mean a 12 sided die with a page printout of the cards would serve as well as trying to make individual cards. Is this correct?
Yes this is correct. A few gamers are doing just that already.