A kick pad on the batter skin helps dramatically. What also helps is what many people advise against, which is...
2. Muffling. A kick drum full of laundry and a comforter is wack, but a totally empty kick becomes very boomy, loses definition and can become hard to hear, and not to mention can have a weird feel/response. IME a thin pillow, large towel, or a folded sheet that touches both heads up to about two or three inches above the shell provides enough muffling without deadening everything yet keeps the sound (and feel) "crisp".
3. Tuning. A kick drum tuned too high is going to sound choked. As mentioned before, JAW is pretty good although might be too slack for some applications (and requires frequent re-tuning). Less than JAW and you're going through skins like toilet paper...
4. Hole/front skin removal. It seems logical that removing the front skin or cutting a large hole in it improves projection but it makes the drum sound dead. Keeping the front skin intact is regarded by many to be optimal but it's not always practical so a 5-6" max hole, off center and about three inches from the edge, is best. Anything bigger than that, or closer to the center, and you may as well remove the skin completely.
TL;DR: Tell him to get a kickpad, put just enough muffling in there to touch a few inches of each head, tune it to just above wrinkle, and keep the front head on with a small, off-center hole.