I'm so sorry you're having such a hard time with your husband, on top of being sleep deprived and trying so hard to figure out how to best mother your little girl. My DH was against co-sleeping at first, too. I finally asked him about it again last week (on our first date in 10 months!!!) and now he says he really likes having her there with us, that it just feels right. Everything I've read about co-sleeping says the same thing: dads really like it. There are some books specifically about co-sleeping you may want to look at: "The Family Bed" by Tine Thevenin, "Sleeping with your Baby" by James McKenna, and a good chapter in "Attachment Parenting" by Katie Granju. Reading really helped me identify why I wanted to gently parent my baby to sleep instead of let her CIO. I understand now there are health risks involved with letting your baby cry, I understand the emotional agony you are putting a tiny infant through when you place that burden on her before she understands what's going on.
It seems like people who advocate letting a baby cry (for sleep or otherwise) are looking for the easy way out, like it's easier on the mother to just shut the door and walk away. Unfortunately, none of those people has the emotional and physical connection that you have with your baby, not even your husband. I truly believe a man cannot understand what it does to us mothers to hear our LOs cry. You ARE NOT doing a disservice to her by tending to her needs, rather you are setting up the stage for a strong attachment first to you, and then to other people. Child psychologists refer to the first year of life as the attachment phase. It is when babies are learning to either have a general trust or mistrust of the world. Meeting her needs for food and comfort now will increase the likelihood of general emotional and physical health later on.
But you know this, you know what's best for your baby. I wish I knew how to make your husband understand.
BTW, the Pantley Pull Off may take some time to have any real effect. In the beginning, it is likely that your DD will just be a little perturbed, but give it time. That's the annoying thing about all gentle sleep solutions. They take time and there's no way of knowing if they will actually work. But CIO doesn't always work either. I suppose you can tell your husband that.