I'd think you could pop the quick releases on the two Alice packs and knot them together, then cinch down tight. The shoulder pads should provide the horse some padding, with more possible with a USGI wool blanket, sleeping bag or even poncho liner. Underneath, any good troop should have enough 550 cord to improvise a cinch (though by 2000, I suppose some kind of light rope or leather straps may have taken the ubiquitous role of 550 cord). Or you could probably improvise something more pleasant for the horse with rifle slings, uniform belts, or cargo straps).
Thinking about it, I would guess this would work best the frames removed from the packs, which could be done with medium Alice easily. The large packs would require some additional improv to fit the shoulder straps to the bag without the frame.
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