You might be interested in reading about marriages that don't require an "official" to preside. Not all states allow such marriages but since you are already married to someone else it seems as though the legality is irrelevant.
My MIL and SIL were both married under a "Quaker license" in Pennsylvania which allows two people to marry themselves without a third party. (Wikipedia article on "Self-uniting Marriage"
.) Perhaps your husband would be interested in being a narrator / master of ceremonies at such a wedding? Introducing you and explaining the nature of the ceremony, and lending his blessing to the event?