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I'm thinking something simpler, using numbers most likely, just trying to find the way to help them blend in best.
P
Lovely painting by the way.
My, admittedly limited, experience with Sharpe practice is that the leaders are usually remembered with the number only really being required for confirmation. Obvious numbers would detract from the spectacle - there already enough shock markers littering up the place. If you make your own tokens then could you do away with numbers entirely? So have tokens in the bag with a picture of the base? Eg abandoned drum, rifles, barrels, livestock, small shrub, flower bed, cabbage patch, camp bed, aide de camp, horse holder, etc, etc.
Other alternative is just write them on the underside of the base.