I can hear the struggle you are having. How difficult to see this behavior in your husband. If he won’t go it is time for you to go to counseling on your own so that you can sort through your options.
What you are aiming to do is have your voice heard in this process — not about whether your husband should or shouldn’t give to his daughter, but rather what the impact is on you. Focus on what the impact is on you and talk to your husband about that.
I do think this is an opportunity for couples therapy and I would encourage you to explain to your husband that the value of going is so both of you can cope with the change that is occurring. The find help tab at the top of the page will identify individual and couples therapists in your area.