Chaos, you might want to check out the post that KLS made in this thread:
http://www.eqemulator.net/forums/showthread.php?t=24671
Her spreadsheet should help to get some idea of the attack rating and accuracy calculations.
I think your idea may work for AR and Accuracy, but I definitely don't think it would be best for min/max damage (not that you mentioned that, but it is another that is auto calculated). But, I would almost rather see another way to find the calculated stats like min/max damage, AR and Accuracy. I think if they were added into the #npcstats command output, that would probably solve the problem for now.