I'm about to run Mausritter for a virtual con in two weeks (Kobold Con) and I am working on an adventure for that. I'll happily share it with you when it's finished. It's going to be a one shot dungeon crawl but in the roots of an old tree and it will feature elements that play into the fact that these are mice (Like human made objects or things to show that the characters are little. I gave the players the link to this site so I don't want to say too much yet).