It has been numerous years since I did the beast from the east side, much better experience from the west but of course you need more days to do it. Unless they specifically state on your permit that you have to stay at outpost then I think you can camp at trail camp. Now having said that outpost camp still might be the better option anyway, lower elevation, trail camp is at 12k, not easy to sleep at that elevation especially if you’re coming up from sea level. You stated that your group isn’t experienced bpackers, another reason to stay at outpost. If you’re then day hiking to the summit figure it might add 2+ hours to the trip instead of staying at trail camp. Good luck and have fun
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