Hiya, just thought i'd chime in here as I also had 1 legal ceremony, 1 wedding and now 2 anniversarys
Similar to you we were going to do the fiance visa for DH and get married in the UK. I booked the wedding - church, reception, photographer, honeymoon etc Anyways, about 6 momths before the wedding we then decided that the spouse visa would be a much better option- being able to work and going on honeymoon and no extra visa!
So i flew with my parents to Orlando and we got married in the courthouse with just them and 2 friends present. Didnt change one single thing come the UK wedding day. I went down to see the vicar and he was more than happy to change our wedding ceremoney to a blessing ceremony. On the day itself you would hardly know anything was different - my dad still gave me away and we still said our vows in church - the vicar tweaked them slightly so they were more appropriate (i reaffirm this vow instead of i make this vow) We also exchanged new rings. The only thing we didnt do was sign the register as that part wasnt needed - we had the choir sing for us in that gap
So all in all we made a fantastic choice for us, my wedding day still felt completely like my wedding day and the same went for all the guests