I’d be in favor of that. Of course, we don’t need to pick an existing track as the word to find, but here are some options depending on whether we want a 3x3 or a 4x4 (in case a longer one is easier to hide)
This contains ROC across the top row and RED down the left column. Note, ROC starting in the first column and continuing down the second column is not valid as it does not form a straight line.