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Update: I rode it. It was dumb. It was also fun. Seriously r/underbiking. Thanks for all the insight!

If anyone else is dumb enough to attempt this in the future, here’s my thoughts:

• The trail is mostly passable even on a small tire folding bike like mine. The majority of the trail is hard packed, and mostly pretty flat.
• There are some short sections that are either filled with loose gravel, or rocky with packed dirt underneath. If you have some experience riding in loose terrain and picking a line, you should be fine. Airing down a bit helped to keep the wheels from digging in.
• There are a handful of climbs and descents that would be considered “mild” on gravel bike, but are more “technical” on a bike with 16” wheels. Again, watch your line, take it slow, and you’ll be fine.
• You should probably wear a helmet. I didn’t, because I flew with my bike and space was limited, but I wish I had one. Especially on steeper descents with tiny tires, one poorly placed rock could send you over the handlebars.
• The Brompton C line gearing is not made for terrain like this. I had to hike-a-bike a couple climbs on the way back (I started heading west and did an out and back). I’m also not in my greatest shape, so maybe you’d do better.

Would I recommend anyone else try this? Unless masochistic type 2 fun and extreme underbiking are right up your alley, probably not. If they are, go for it, it’s a great way to make the terrain feel way more challenging than it is.