Here is a chart for Fighting Formations that can be used to substitute a dice roll in place of pulling chits from a container for units that have received a hit.
There are 80 chits in the game with a result on each side, one for infantry and one for armor. There are an even number of chits for each possible result so I divided the distribution by two to get 40 results. Note that the least common chit is Unc Kill for infantry. There are four in the game so there are two of this result on the chart. Other chit probabilities are reflected as well.
With this system the probabilities for subsequent results after any chit is pulled are not changed though generally the changes will be small with the chits.
To use the chart (CRT), roll a d20 and a d6. If the d6 is a 1, 2 or 3, read the d20 as rolled. If the d6 is 4, 5 or 6 add +20 to the d20 (for example, if the d20 is "16" it becomes "36" if the d6 is "high"). Read the result off the chart for infantry or armor and then find the chit and place it on the unit as per the rules.
This file was done using Open Office. It should work fine in other spreadsheets. There are two copies of the chart on the page so you can print once, cut out and have a copy for each player.