Just some general comments, and they might not apply to your questions. But they might be useful to others.
When we teach first aid things to anyone, we usually address "kits". Now all of us know that kits will require different things for home, car, Patrol, Troop, or large assembly gatherings. But when teaching about kits, always tell audiences that the best kit is what they make, not buy. I always tell anyone that if they buy a kit, please know what's in it. I've known people that had a first aid kit, they've never opened. That's like having a fire extinguisher you can't operate
So I hope these Units each have someone responsible for their first aid issues, then they'll know to "Be Prepared", haha.
Next, it would be unlikely to learn of every possible location for emergency help along any route. I didn't know this was a requirement, but it would take some research, and that will still leave some out. Perhaps if some are identified along the way, it will address the requirement? Local BSA Councils can answer that, or your own H&S Chair, ARC Chapter offices, the "Y" locations, Firehouses, Police Stations, Military establishments, CERT and other community groups...are some possibilities. Just correspond with home Troops that lie along the route. They should know this, or need to, woo-hoo.