M.H.
Your husband needs an education on baby development and nutrition. I also think he needs to man up and speak up. If he's feeling neglected then he needs to say that and then you two can have an adult conversation. Blaming his feelings on the baby is childish and frankly he needs to come to terms with the fact that he is not number one anymore. How is formula supposed to make the baby more independant anyway? It's not like he can hold his own bottle. Hubby needs to step up on the consoling as well. Maybe part of his issue is that he doesn't feel like he has a place in the baby rearing. I agree with the suggestion to pump and let Dad feed with a bottle.
Having said that, my daughter was the exact same way. We ended up wearing her ALOT. We used a baby bjorn and she loved to be facing out. That made her perfectly happy. You cannot spoil a 6 month old. It's simply not possible. It may be seperation anxiety or it just maybe that the world is a far more interesting place when he is being carried around - higher perspective and more things coming into view and close to Mama (and Daddy) - what could be better?
And no need to worry that this will lead to a clingy child. My daughter is a very independant 4 yr old.