It is going to be expensive. A typical drop camp for 4 people for a week -10 days will take 4 riding horses, 4 pack horses, a day or two to set up the drop camp, 2-3 days to get the camp out after the season, plus meat runs/ wellness checks every other day . That is why folks get charged $2500 per head instead of $4000 for a guided hunt. Many times the USFS permit require a SET camp as part of the use permit for the outfitter.
I think with a well developed relationship, with the right outfitter (lots of "ifs" i know). It
could be a workable situation. No Outfitter wants his Drop camp clients complaining that he packed someone up into the basin they were hunting. If you are the drop Camp and spike out from there, you are that much closer.
To give some perspective:
...an up to 14 day horse rental would be $400 plus delivery ($1.65 per loaded mile) from Thompson Falls.
http://www.bigskyhorseleasing.com/
a packer doing a gear drop has a lot of other roles he could be filling during the hunting season that are higher return. That is part of what makes hunting season rates more expensive. Lots of time stock is stretched thin to get guided hunters to camp, more stock gets sore from guys riding with heavy packs, and unbalanced saddles, they travel more miles off trail, and burn more feed.
Hunting season operating costs are 1.5 X more than summer if not more....