Sounds like a super awesome idea.
Just some top of mind feedback...
Here in California many of the orienteering club events work closely with the local land management agencies. It might be a good idea to coordinate with the local NFS office. I know once I was on a public land hiking where it was posted "stay on trail" and came across a 2 person orienteering team coming from off trail. When I mentioned this to the ranger at the TH, he knew all about them. Given how remote your area is, the NFS should also know whether there are possible illegal (drug) activities going on that could put the Scouts at risk.
Second, have a detailed emergency plan that spells out what to do: self evacuate, call you, call 911, etc in case someone breaks a leg. If the local land management agency knows there are 20 scouts out in the woods in section 123 (See above), it could speed up any response.
Third work with your Scouts on how to implement the LNT principles. They are principles after all not rules. Sometimes we need to travel on surfaces that are not durable but still need to use our brains to practice the ethic of LNT.