My wife and I had more of a concert than a wedding. We were very fortunate that we had a family friend to play the organ for the 'churchy' bits. We sat down with a group of friends of mixed voices, sang htem all, experimented and agreed that they would be much more singable if we brought the feys down by 1.5 to 2 whole tones. We advised the organist and she was happy to accede. Come wedding day I turned to wife on each occasion that these hymns were being sung and said something like "That bitch is playing them in the original keys". When I tackled her afterwards she smiled sweetly and said "I figured that on the actual day that you'd be too excited to even notice".This has been a fascinating thread. I hope that Rebecca has fared well.
Regards, John