Does / could this Scout use enough UL techniques to use a small soft-framed (stitched through the padding) pack? I've got a previous-generation UL pack that I haven't used a in a long time. Alpenlite brand, about 24 ounces, about 55 liters plus two supplemental sides pockets of about 4 liters each. A foam pad lashed on the outside would be fine. A 5-pound, bulky sleeping bag lashed on the outside wouldn't be so good.
It wouldn't fit a large sleeping bag at all, but my 13-year-old son has used it on a 3-nighter with some UL gear and techniques. An outside-the-box possibility is for him to trade pounds with someone else. Be the one to carry the fuel or food and someone else lash his sleeping bag on the top of their pack frame.
Anyway, it would be a freebie. PM me so I don't miss your reply. I'm off to Juneau for a few days, back on Monday.