I have a leather balm in the works that would be particularly well-suited. It's a highly refined clear jojoba (liquid wax esters--non-drying and chemically similar to natural skin oils) blended with cetyl palmitate and cetyl alcohol, which are the primary components of spermacetti -- though now derived from palm oils rather than sperm whales! They're a remarkably stable, hard, waxy solid at room temperature, and they all combine to give a very non-greasy feel that absorbs readily into the leather, applies nice and smooth, and will not oxidize as it ages, preventing hardening and cracking of the leather like happens with neatsfoot or mink oil. I've been using it on my own leather items for a while now, and even on my lips when they've been chapped--it's good for your own skin, too lol