Update: Looks like everything in the MR library was made for old formats and I can't preview the formatting without downloading and possibly converting them first, but the Kindle Store has a
ton of different versions, all for under a few bucks!
https://www.amazon.com/kindle-dbs/en...opularity-rank
I'll just grab a few of these and figure out which one will be the most convenient to tweak in Calibre. (I'll post in here when I've decided, so others can benefit.)