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I just created my first DnD one-shot
(hexbear.net)
Tabletop, DnD, board games, and minecraft. Also Animal Crossing.
3rd International Volunteer Brigade (Hexbear gaming discord)
Rules
I honestly didn't even think that far, I just copy-pasted the scene in Foundry full of them as background characters for the final scnee and then thought "you know what would be funny..."
Running them as swarms seems like the easiest solution
There is an excellent supplement called Drops in a Pond. It is intended for Fate systems but it is a really good read for anyone who wants to run massive battles.