You could easily use my percentage-based passing method and tweak the numbers to fit any percentages:

http://www.miniaturefootball.com/for...-based+passing

Passing Percent
 

When I used dice for passing in the 1970's, I combined the dice rolls of 2 6sided dice. If you use the number 7 and above you got 58.3% completions. If use 6 and above it is 72.2% completion rate. At number 2 it is an interception. If the number is 12 (2.7%) it is turn and burn. This worked out well in our jr high league.$cch$ $cch$